One way to reduce the volume of hydrogen gas needed to power a car for 400 km is to use a technology called on-board hydrogen storage.
This involves compressing the hydrogen gas to very high pressures, typically between 5,000 and 10,000 psi, which significantly reduces its volume.
Another method is to use liquid hydrogen storage, which involves cooling hydrogen gas to its boiling point (-423.17°F or -252.87°C) and storing it in a cryogenic tank. At this temperature, hydrogen gas is in its liquid state and takes up much less space than when it is in its gaseous state.
Both of these methods of hydrogen storage can greatly reduce the volume of hydrogen needed to power a car for 400 km, making hydrogen fuel cell cars more practical and feasible for everyday use.
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Convert mmol to mol (Millimole to Mole)
To convert millimoles to moles, multiply the number of millimoles by 0.001.
A millimole (mmol) and a mole are both units of measurement for the amount of a substance. One mole is defined as the number of atoms in 12 grams of pure carbon-12, which is equivalent to 6.022 x 10^23 atoms. A millimole is 1/1000th of a mole, or 6.022 x 10^20 atoms.
Conversely, to convert moles to millimoles, multiply the number of moles by 1000. For example, if you have 0.05 moles of a substance, 0.05 x 1000 = 50 millimoles.
It's important to note that the conversion factor between millimoles and moles is dependent on the molecular weight of the substance being measured and the conversion factor used may differ between substances. It's also important to specify the unit of measurement when expressing the amount of a substance, to avoid confusion and ensure accurate communication.
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Determine the reducing agent (if any) in the following reaction Pb(NO3)2(aq) + 2 LiCl(aq) - PbCl2(s) + 2 LINO3(aq) Ins LICI LINO3 You "drag Pb(NO3)2 PbCl2 there is no reducing agent as this is not an oxidation-reduction reaction
There is no reducing agent in this reaction as it is not an oxidation-reduction reaction.
In the given response, Pb(NO3)2 and LiCl are the reactants and PbCl2 and LiNO3 are the items. This response includes no exchange of electrons between the reactants and items, and that implies there is no adjustment of the oxidation condition of any of the iotas in question. In this way, it's anything but an oxidation-decrease (redox) response, and there is no lessening specialist included.
In redox responses, the lessening specialist is the substance that loses electrons and gets oxidized, while the oxidizing specialist is the substance that acquires electrons and gets diminished. Be that as it may, for this situation, there is no adjustment of oxidation states, and subsequently, no decreasing specialist can be distinguished. It is vital to take note of that not all responses include redox cycles and it is significant to distinguish the idea of the response prior to recognizing the diminishing or oxidizing specialists.
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When NaHCO3 and H2O mix do the produce or absorb heat?Also do they form a gas?
how to tell if something is more soluble in solubility curve
Answer:
To find the least soluble substance at a given temperature we follow the temperature line up and the first substance curve we hit is the least soluble. For most soluble it is the same procedure except the last substance curve hit is the most soluble.
To determine if a substance is more soluble or less soluble based on a solubility curve, you need to compare the solubility values at different temperatures. Here's how you can interpret a solubility curve:
1. Higher Points on the Curve: If a point on the curve is higher, it indicates that the substance is more soluble at that temperature. In other words, at higher temperatures, the substance can dissolve in a greater amount.
2. Lower Points on the Curve: If a point on the curve is lower, it means that the substance is less soluble at that temperature. In this case, at lower temperatures, the substance can dissolve in a smaller amount.
3. Comparing Points: By comparing the solubility values at different temperatures, you can determine which temperature has a higher solubility and which has a lower solubility. The steeper the slope of the curve, the faster the increase or decrease in solubility with temperature.
Solubility curves provide a graphical representation of the relationship between temperature and solubility. They allow you to determine the solubility characteristics of a substance and how it changes with temperature.
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3. Industrial strength laundry bleach is an aqueous solution containing 1.34 M sodium hypochlorite by mass. What is the mass percent of sodium hypochlorite of this solution
To find the mass percent of sodium hypochlorite in the industrial strength laundry bleach solution, we need to calculate the mass of sodium hypochlorite and the total mass of the solution.
First, let's assume we have 100 grams of the industrial strength laundry bleach solution. This means we have 100 grams of the solution containing 1.34 moles of sodium hypochlorite (NaOCl), as the solution has a concentration of 1.34 M.
The molar mass of sodium hypochlorite (NaOCl) is:
Na: 22.99 g/mol
O: 16.00 g/mol
Cl: 35.45 g/mol
So, the molar mass of NaOCl is:
22.99 g/mol + 16.00 g/mol + 35.45 g/mol = 74.44 g/mol
Now, let's calculate the mass of sodium hypochlorite in 1.34 moles:
Mass of sodium hypochlorite = 1.34 mol × 74.44 g/mol = 99.79 g
Therefore, in 100 grams of the industrial strength laundry bleach solution, there are 99.79 grams of sodium hypochlorite.
To find the mass percent, we divide the mass of sodium hypochlorite by the total mass of the solution (100 grams) and multiply by 100:
Mass percent of sodium hypochlorite = (99.79 g / 100 g) × 100% = 99.79%
The mass percent of sodium hypochlorite in the industrial strength laundry bleach solution is approximately 99.79%.
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in the laboratory you dilute 2.34 mL of a concentrated 3.00 M perchloric acid solution to a total volume of 150 ml what is the concentration of the dilute solution
The concentration of the dilute solution is 0.0468 M. To calculate the concentration of the dilute solution, we can use the equation:
C1V1 = C2V2
Where:
C1 = Concentration of the concentrated solution
V1 = Volume of the concentrated solution
C2 = Concentration of the dilute solution
V2 = Volume of the dilute solution
Given:
C1 = 3.00 M
V1 = 2.34 mL = 2.34 mL * (1 L / 1000 mL) = 0.00234 L
V2 = 150 mL = 150 mL * (1 L / 1000 mL) = 0.150 L
Plugging the values into the equation:
(3.00 M)(0.00234 L) = C2(0.150 L)
0.00702 = 0.150 C2
C2 = 0.00702 / 0.150
C2 = 0.0468 M
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In a titration, 15.65 milliliters of a KOH(aq) solution exactly neutralized 10.00 milliliters of a 1.22 M HCl(aq) solution.
Complete the equation below for the titration reaction by correctly identifying the formula of each product.
HCl(aq) + KOH(aq) →. +
1) HCl(aq) + KOH(aq) - KOCI + H₂
2) HCl(aq) + KOH(aq) → CIO + H₂K
3) HCl(aq) + KOH(aq) H₂CI+ OK
4) HCl(aq) + KOH(aq) + H₂O + KCI
The balanced equation for the neutralization reaction between hydrochloric acid (HCl) and potassium hydroxide (KOH) is:
4. HCl(aq) + KOH(aq) → KCl(aq) + H2O(l)What is neutralization reactionA neutralization reaction is a chemical reaction between an acid and a base that results in the formation of a salt and water.
In this type of reaction, the H+ ions from the acid react with the OH- ions from the base to form water, while the remaining ions from the acid and base combine to form a salt.
The general equation for a neutralization reaction is:
acid + base → salt + water
The reaction between HCl and KOH produces potassium chloride (KCl) and water (H2O).
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Hello! So I need help with these neutralization reactions and its fill in the blank. The question asks,
Balance the following neutralization reactions:
_______ HBr + _______ KOH _______KBr + _______H2O
_______ HF + _______ Fe(OH)3 _______FeF3 + ______ H2O
______HCl + _______ Ca(OH)2 _______CaCl2 + ______ H2O
The balanced equation for the neutralization reactions is as below.
Balancing chemical reaction equationsIn order for chemical equations to be balanced, the number of atoms of each element before and after the reaction must be equal.
Thus:
\(HBr + KOH --- > KBr + H_2O\)\(3HF + Fe(OH)_3 --- > 3 H_2O + FeF_3\)\(2HCl + Ca(OH)_2 --- > CaCl_2 + 2H_2O\)More on balancing chemical equations can be found here: https://brainly.com/question/15052184
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how many elements and atoms are in tylanol
Answer:
Element Symbol # of Atoms
Hydrogen H 9
Carbon C 8
Nitrogen N 1
Oxygen O 2
Explanation:
there are 5 elements
16
A piece of wire is attached
from the top of a 45 foot utility
pole to a stake in the ground. If
the angle of elevation from the
stake to the top of the pole is 39º.
find the length of the wire. Round
to the nearest tenth.
Wilson Type 2013
HELP. Pls
The length of the wire is approximately 53.9 feet.
To find the length of the wire, we can use the trigonometric relationship of the angle of elevation.
Given:
Height of the pole (vertical side) = 45 feet
Angle of elevation (opposite side) = 39º
We can use the trigonometric function tangent (tan) to relate the height of the pole and the length of the wire.
Tangent of the angle of elevation (tanθ) = Height of the pole / Length of the wire
tan(39º) = 45 / Length of the wire
Rearranging the equation to solve for the length of the wire:
Length of the wire = Height of the pole / tan(39º)
Substituting the values:
Length of the wire = 45 / tan(39º)
Calculating this using a calculator or trigonometric table, we find:
Length of the wire ≈ 53.9 feet
Therefore, the length of the wire is approximately 53.9 feet when rounded to the nearest tenth.
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Calculate the number of molecules in 200g of nitrogen gas.
Answer:
Explanation:
2.38 moles
There are 2.38 moles present in a 200-gram sample of sodium bicarbonate with a chemical formula of NaHCO3.
Answer:
Number of moles = weight of substance / molar mass of substance. Therefore, 100 grams of N2 = 100/ 28 moles. Number of molecules of N2 = number of moles x Avogadro number. Since, N2 is diatomic molecule which contain two atoms of nitrogen.
Do you think the benefits of nuclear power outweigh the potential drawbacks
Answer:
Yes
Explanation:
Yes, the positives of nuclear energy overshadow the possible risks, since it has relatively low maintenance costs, provides ample electricity to satisfy demand, and has a number of other comparative benefits that can not be overlooked.
It is cleaner than traditional carbon and other fuels, not to overlook the looming threat of environmental effects triggered by the increased use of traditional energy sources.
In a healthy pond, the temperature is 16°C (61°F). What is the most likely pH of this pond?
A. 6.3
B. 5.3
C. 5.0
D. 4.0
Answer:
A . 6.3 In a healthy pond, the temperature is 16°C (61°F). What is the most likely pH of this pond
In a healthy pond, the temperature is 16°C (61°F). 6.3 is the most likely pH of this pond.
What do you mean by pH ?A measure of the acidity or basicity of a substance or solution. The pH scale ranges from 0 to 14. A pH value of 7 is neutral on this scale, indicating that it is neither acidic nor basic.
A pH value less than 7 indicates that it is more acidic, while a pH value greater than 7 indicates that it is more basic.
"Potential of Hydrogen" is the full form of pH. The negative logarithm of H+ ion concentration is known as pH. As a result, the meaning of the name pH is explained as hydrogen strength or power.
Thus, In a healthy pond, the temperature is 16°C (61°F). 6.3 is the most likely pH of this pond, so the pond is more acidic in nature.
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Which of the following 0.150 m solutions has the
greatest boiling-point elevation?
Mg(NO3)2
NaNO3
C2H4(OH)2
The solution with the greatest boiling-point elevation among the given options is Mg(NO₃)₂.
The boiling-point elevation of a solution depends on the concentration of solute particles. In this case, we have three solutions: Mg(NO₃)₂, NaNO₃, and C₂H₄(OH)₂.
Mg(NO₃)₂ dissociates into three ions: Mg²⁺ and two NO₃⁻ ions. NaNO₃ dissociates into two ions: Na⁺ and NO₃⁻. C₂H₄(OH)₂ does not dissociate, so it remains as one molecule.
Since the boiling-point elevation is directly proportional to the number of solute particles, Mg(NO₃)₂, with three ions per formula unit, will have the greatest boiling-point elevation. NaNO₃ has two ions per formula unit, and C₂H₄(OH)₂ has no ionization, resulting in fewer solute particles and lower boiling-point elevation compared to Mg(NO₃)₂.
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i need help so what would you do if you have a boyfriend that lives an hour and 8 minutes away from you and its been almost 3 months and you love him but it hurts that you cant see him, then a guy you liked for over a year told you he likes you back and would give you the relationship you've always wanted in person....who would you pick
Answer:
Probably the one you are already dating...
Explanation:
...but if you really like the other guy then you should chose him.
what element has 3 valence electrons in the 3rd energy level
Answer:
Aluminum (Al)
Explanation:
It has 3 electron orbitals and has 3 valence electrons
Given the standard enthalpy changes for the following two reactions
Given the standard enthalpy changes for the following two reactions:
(1) 2C(s) + 2H2(g)C2H4(g)...... ΔH° = 52.3 kJ
(2) 2C(s) + 3H2(g)C2H6(g)......ΔH° = -84.7 kJ
what is the standard enthalpy change for the reaction:
(3) C2H4(g) + H2(g)C2H6(g)......ΔH° = ?
The standard enthalpy change for reaction (3) is 117.1 kJ.
The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.
To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.
First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):
C2H4(g)C2H6(g) ΔH° = -52.3 kJ
Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ
Now, we add the two modified equations together:
C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ
When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):
C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ
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help quick!!!!!!
How can you observe the law
of conservation of energy in
action at the skate park? How
does this show that energy
was not created or destroyed?
The law of conservation of energy states that energy cannot be created or destroyed but can be converted or transferred. So when you're eating a burger which has chemical energy, it is transferred to mechanical energy if you go out and ride a bicycle. Another example is when the Sun which is thermal energy shines on the apple tree, it is converted to chemical energy because the apple has chemical energy. Transferred is pretty similar.
The law of conservation of energy is obeyed as the potential energy is converted to kinetic energy and is neither created nor destroyed.
What is the law of conservation of energy?According to the law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
The law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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The overnight temperature in Polokwane drops from 11° C to -2° C. By how many degrees has the temperature dropped?
which is the correct formula for the compound formed between beryllium and nitrogen?
Answer:
Be3N2
Explanation:
u cross multiply with their subscripts
Where within the cell does the process of respiration take place?
Answer:
cytoplasm
Explanation:
Answer:
mitochondria
Explanation:
While most aerobic respiration (with oxygen) takes place in the cell's mitochondria, and anaerobic respiration (without oxygen) takes place within the cell's cytoplasm
Which direction will heat energy transfer in this system, assuming the barrier is left in place
From the 300 K side
Back and forth
from the 75 k side
Heat energy will transfer from the 300 K side to the 75 K side due to the difference in temperature. The barrier will prevent the heat energy from transferring back to the 300 K side, so the heat energy will remain on the 75 K side.
What is Heat energy?Heat energy is a form of energy that is produced when molecules move faster and have more kinetic energy. It is the transfer of energy from a hotter object to a cooler object and is a form of thermal energy. Heat energy is used in many everyday activities such as cooking, heating buildings, and running industrial processes. Heat energy can also be used to generate electricity by using steam turbines and other methods. Heat energy can also be used to produce mechanical energy to drive machinery. Heat energy is essential for life on earth as it helps to keep organisms warm and sustain certain chemical reactions that are vital for survival.
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sulfide is formed when copper and sulfur are heated together. In this reaction, 130 g of copper reacts with 45 g of sulfur. After the reaction is complete, 8.0 g of unreacted sulfur remain. What is the mass of copper(II) sulfide formed?
The mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
How to calculate mass of products and reactants?The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.
This law further explains that in a chemical reaction, the mass of the reactants must equal the mass of the products.
According to this question, sulfide is formed when copper and sulfur are heated together. In a reaction, 130 g of copper reacts with 45 g of sulfur.
However, after the reaction is complete, 8.0 g of unreacted sulfur remain. This suggests that the mass of sulfide produced is as follows:
(130g + 45g) - 8g = 167g
Therefore, the mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
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Which measurement is a vector?
If the brine contains 138 g of NaCl, how much Cl2 can be produced?
Answer:
167.5g
Explanation:
From the question, we know the mass of NaCl and the molar mass of NaCl, so we can calculate the number of moles of NaCl:
Moles = mass ÷ molar mass
The molar mass of NaCl can be calculated by adding the relative formula masses of the elements Na and Cl:
23.0 + 35.5 = 58.5
We can use the formula to find the number of moles of NaCl:
moles = 138 ÷ 58.5
= 2.35897...
Now, we need to find the mass of Cl2. Rearranging the formula of moles = mass ÷ molar mass
mass = moles × molar mass
Calculating the molar mass of Cl2 by adding the relative atomic masses:
35.5 + 35.5 = 71
Hence the mass is:
2.35897... × 71 = 167.5g (to 1dp)
3 CACO3+2H3PO4>CA3(PO4)2+3 CO2+3 H2O
Answer:
its hto-567-st-3=56+78=103
Explanation:
so103 is yo answer
What is Delta. Gsystem for the system that is described by the following data? Delta. Hsystem = –232 kJ, T = 293 K, Delta. Ssystem = 195 J/K Delta. Gsystem = Delta. Hsystem – TDelta. Ssystem –289 kJ –175 kJ 256 kJ 56,903 kJ.
The value of Delta G system for the system that is described by the following data Delta. H system = –232 kJ, T = 293 K, Delta. S system = 195 J/K is -175 kJ.
Delta G or ΔG is a measure of the available energy in a chemical system that can do work under constant temperature and pressure conditions. Gibbs Free Energy is a thermodynamic property that is used to determine whether a reaction will be spontaneous or non-spontaneous.
The Gibbs Free Energy equation is:ΔG = ΔH - TΔS
Substituting the values given into the formula:
ΔG = (-232kJ) - (293K x (195J/K))
= -232,000 - (57,135)
= -289,135 J or -289.135 kJ
In conclusion, the value of Delta Gsystem for the system that is described by the following data Delta. Hsystem = –232 kJ, T = 293 K, Delta. Ssystem = 195 J/K is -175 kJ.
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the energy required to break one mole of chlorine-chlorine bonds in cl2 is 242 kj/mol. what is the longest wavelength of light capable of breaking a single chlorine-chlorine bond?
The longest wavelength of light capable of breaking a single chlorine-chlorine bond is 494mm.
The energy required to break one mole of Cl−Cl bonds in Cl₂ is 242 kJ mol⁻¹. The longest wavelength of light capable of breaking single Cl−Cl bond is 494mm(c=3×10⁸msec⁻¹,N= 6.023×10²³mol⁻¹). Bond energy is defined by the sum of all of the bonds broken minus the sum of all of the bonds formed: ΔH = ∑H(bonds broken) - ∑H(bonds formed). ΔH is the change in bond energy, also referred to as the bond enthalpy and ∑H is the sum of the bond energies for each side of the equation. Overall energy for a chemical reaction = Total energy of bond breaking + Total energy for bond forming. Remember, that the total energy for bond forming is always a negative value.
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Atomic Mass is the ___________ of the mass numbers of all the isotopes of an element.
Answer:
Number of proton + No of electron
Explanation:
Mark me brainlist
Answer:
No of neutron + no of protons
Explanation:
Since atomic mass is the sum total of the neutron and mass number then we can say that, neutron number plus proton number is the mass number of all isotopes.
Convert the following 3grams = milligrams
Answer:
3000 milligrams
Explanation:
to get milligrams you add 3 zero at the end