The molar mass of the compound PBr 5 is: A. 110.9 amuB. 430.6 amuC. 110.9 grams D. 430.6 grams

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )

A conjugate acid-base pair, as defined by Bronsted-Lowry, consists of two compounds that are distinct only in that they contain a proton (H⁺). The addition of a proton to a base results in the formation of a conjugate acid, while the removal of a proton from an acid result in the formation of a conjugate base.

The reaction becomes:

HF + H₂O → H₃O⁺ + F⁻

The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )

Here,

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Answer:

Partial lunar eclipse.

Explanation:

A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.

Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).

Without doing any calculations, the closest value for the average atomic mass of the element m is (a) the highest percent abundance & (d) 13.4.

The weighted average mass of the atoms that make up a naturally occurring sample of an element is what's referred to as its average atomic mass, which is also frequently referred to as its atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.

Since the average atomic mass of the element is close to the element with the highest percent abundance, which is close to 13.4 after doing the calculations, we got 13.815, which is close to 13.4.

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Considering the ideal gas law, the volume occupied by 3.25 moles of an ideal gas at a temperature of 18.00°C is 686.71 L.

An ideal gas is the behavior of those gases whose molecules do not interact with each other and move randomly. Under normal conditions and under standard conditions, most gases exhibit ideal gas behavior.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T), related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the ideal gas law:

1.13 atm×V = 3.25 mol× 0.8205 L.atm/K.mol× 291 K

Solving:

V = (3.25 mol× 0.8205 L.atm/K.mol× 291 K)÷ 1.13 atm

V= 686.71 L

Finally, the volume is 686.71 L.

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sulfide mineral is made of from metal and sulfphur

Sulfide, also written sulphide, is a category of chemicals that contain sulfur and one or more metals. The majority of sulfides have basic structural characteristics, great crystallographic symmetry, and numerous metal-like characteristics, such as metallic lustre and electrical conductivity.

Sulfides include, for instance, chalcopyrite, galena (the primary ore mineral for lead and silver), and cinnabar (the primary ore mineral for mercury) (which provides copper).

Sulfide minerals are composed of sulfur and one or more metals; sulfarsenides have some of the sulfur replaced with arsenic.

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To prepare a buffer with a pH of 7.2, the best conjugate pair to use would be H2PO4- (acid) and HPO42- (base). To prepare the buffer solution, a solution of H2PO4- would be prepared and then neutralized. The ratio of base to acid would be 1.

(a) This is because the pKa of H2PO4- is 7.2, which is closest to the desired pH value of 7.2. A buffer solution consists of a weak acid and its conjugate base, and its pH is determined by the relative amounts of the two species present in the solution. By choosing a conjugate pair with a pKa value close to the desired pH, the buffer will be most effective in resisting changes in pH when small amounts of acid or base are added.

(b) To prepare the buffer solution, a solution of H2PO4- would be prepared and then neutralized with the appropriate amount of NaHPO4 (the salt of the conjugate base HPO42-). The ratio of base to acid would be determined by the desired pH and the pKa of the acid. The formula for the ratio of base to acid in a buffer solution is given:

In this case, the desired pH is 7.2 and the pKa of H2PO4- is 7.2, so \(Base/Acid = 10^{7.2 - 7.2}\) = 1. This means that equal amounts of H2PO4- and HPO42- would be present in the buffer solution.

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Answer:2. C Hydrochloric acid

Explanation:

Answer:

the answer to #2 ic C. hydrochloric acid.

Explanation:

The correct answer for emperical and molecular formula = C5H14N2 .

3.23 g x (12.011 / 44.0098) = 0.8815 g carbon

1.865 g x (2.016 / 18.0152) = 0.2087 g Hydrogen

1.58 g x (28.014 / 108.009) = 0.4098 g Nitrogen

1.50 g minus (0.8815 + 0.2087 + 0.4098) = 0.

Convert each element's mass to moles.

0.8815 g/12.011 g/mol = 0.0734 mol carbon

0.2087 g 1.008 g/mol = 0.207 mol Hydrogen

0.4098 g 14.007 g/mol = 0.02926 mol Nitrogen

Step three is to calculate the ratio of molar amounts expressed in the smallest, whole numbers.

0.0734 mol 0.02926 mol = 2.51 carbon

7.07 mol hydrogen = 0.207 mol 0.02926 mol

Nitrogen: 0.02926 mol = 1 Nitrogen: 0.02926 mol = 1

Doubling each value yields C = 5, H = 14.14, and N = 2, resulting in the empirical formula C5H14N2. 

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Answer:

B & C

Explanation:

The forms of energy that are made up of waves are:

B. Light

C. Sound

The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist

Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature

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try and find a better answer or ask ur teacher please

The correct match is as follows:

Pressure and heat - Metamorphic rock

Cooling magma - The Intrusive igneous rock

Cooling lava - The Extrusive igneous rock

Erosion and Deposition - Sedimentary rock

This is because Metamorphic rocks are formed as a result of past existing rocks changing form. If the igneous and sedimentary rocks are exposed to high temperature and pressure, they then become metamorphic rocks.

Intrusive igneous rocks form when magma cools slowly. This process soon results in the formation of large-crystal like structures. Whereas, when exposed to the atmosphere lava cools rather quickly. This faster cooling process forms extrusive igneous rocks. The fast cooling lava creates smaller crystals and a smoother surface.

The sediments that are formed as a result of weathered rocks are usually deposited on the surface of Earth, or at the bottom of rivers and oceans. Over time, sediments collect and form layers over the most recent layer. This leads to the formation of sedimentary rocks.

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Answer:

I believe this is your answer, or wait I know this is your answer

Explanation:

Answer:

32 C

Explanation:

The conversion formula is:

( TempF  -32 ) X 5/9

So:

(88.7 - 32) x 5/9

56.7 x 5/9  =  31.5C

Significant digits will make you round you answer off to 32 C

Your final answer may have no more significant figures to the right of the decimal than the LEAST number of significant figures in any number in the problem.  Part of your equation subtracts 32 that has no significant digits to the right of the decimal.

Answer:

B) At equilibrium, the concentration of the products will be about the same as the concentration of the reactants.

This is because equilibrium means equal state

Answer: B) At equilibrium, the concentration of the products will be about the same as the concentration of the reactants.

Explanation:

Answer:

For example, in the food chain, plants move carbon from the atmosphere into the biosphere through photosynthesis.Animals that eat plants digest the sugar molecules to get energy for their bodies. Respiration, excretion, and decomposition release the carbon back into the atmosphere or soil, continuing the cycle.

Explanation:

Above 100°Celsius is the temperature at which the substance is converted into a gas.

Different liquids have different boiling points at which they change from liquid to gaseous state. The boiling point of water is 100°Celsius means at 100°Celsius or above temperature, the water changes from liquid form into gas form or vapour form so we can conclude that at high temperature i.e. above 100°Celsius the substance is converted from liquid state to gaseous state.

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Answer: \(6.276\ kJ\)

Explanation:

It is known that 1 cal is equivalent to 4.184 J

1500 cal will be equivalent to \(1500\times 4.184=6276\ J\)

Also, 1 kJ is equivalent to 1000 J

So, 6276 J is equal to \(6.276\ kJ\)

Hypothesis is a proposed explanation for an observable phenomenon. The term comes from the Greek word for "to suppose." Variables, on the other hand, are anything that can be changed or measured. Variables can be independent, dependent, or control variables. Learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis” share similarities and differences with a question that comes in response to an observation and a scientific research question.

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Calcium carbonate is the active ingredient in agricultural lime.

Calcium carbonate is the calcium salt with formula CCaO3. It has a role as an antacid, a food coloring, a food firming agent and a fertilizer and much more. It is a calcium salt, a carbonate salt, a one-carbon compound and an inorganic calcium salt.

Calcium carbonate is used therapeutically as a phosphate buffer.

488 moles of calcium carbonate (CaCO3) can be calculated by using its molecular weight. Calcium carbonate has a molecular weight of 100.0869 g/mol. To calculate the mass of 488 moles, we can multiply the molecular weight by the number of moles:

mass = molecular weight x number of moles

mass = 100.0869 g/mol x 488 mol

mass = 48,842.4072 g

So, the mass of 488 moles of calcium carbonate is approx. 48,842.4072 grams.

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Answer:

4.2g of gasoline

Explanation:

In the problem, you need to give energy to the cup from the combustion of gasoline. The energy you need to give is:

Qcup + QWater + QCopper

As you need to increase (110ºC - 21ºC = 89º = Increase 89K) 89K, the Qcup is:

Qcup = 89K × (47J/K) = 4183J.

You can find Qwater using its specific heat, C (4.18Jg⁻¹K⁻¹), its mass (450mL = 450g) and the change of temperature, 89K:

QWater = CₓmₓΔT

QWater = 4.184Jg⁻¹K⁻¹ ₓ 450g×89K

QWater = 167569J

And Q of Copper, QCu, could be obtained in the same way (Specific heat Cu: 0.387 J/g⁻¹K⁻¹:

QCu = CₓmₓΔT

QCu = 0.387 J/g⁻¹K⁻¹ₓ850gₓ89K

QCu = 29277J

Thus, total heat you need is:

Q = Qcup + QWater + QCopper

Q = 4183J + 167569J + 29277J

Q = 201029J = 201kJ

The combustion of gasoline (Octane) produce 47.8kJ/g (Its heat of combustion). that means to produce 201kJ of energy you require:

201kJ × (1g / 47.8kJ) =

20.23grams

Given the chemical equation below;

Determine the mole of AlCl3

Mole = Mass/molar mass

mole of AlCl3 = 100/133.34

Mole of AlCl3 = 0.749moles

According to stoichiometry, 2 moles of AlCl3 produced 2 moles of Al, hence the mole of Al required is 0.749moles

Determine the mass of Al

Mass of Al = 0.749 * 26.98

Mass of Al = 20.23grams

Hence the mass of Al that can be produced is 20.23grams

Answer:

what is your zoom email

teĺlllll

Answer:

39.7%

Explanation:

To obtain the percentage composition of chromium (Cr) in Na₂Cr₂O₇, do the following:

Molar mass of Na₂Cr₂O₇ = (23×2) + (52×2) + (16×7)

= 46 + 104 + 112

= 262 g/mol

Mass of Cr in Na₂Cr₂O₇ = 2 × 52 = 104 g

Percentage composition of Cr = mass of Cr / Molar mass of Na₂Cr₂O₇ × 100

= 104 / 262 × 100

= 39.7%

Thus, the percentage composition of chromium (Cr) in Na₂Cr₂O₇ is 39.7%

Answer:

i.e. mass of 1 mole of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g = 180.18 g (using atomic weight data to 2 decimals) 1 mole of carbon atoms weighs 12.01 g and there are 6 moles of C atoms in 1 mole of glucose, so the mass of carbon in 1 mole of glucose = 6 × 12.01 g = 72.06 g.

Answer:

1.03 x 10²³ atoms NaCl

Explanation:

To find the amount of table salt (NaCl) in atoms, you need to (1) convert grams to moles (using the molar mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.

(Step 1)

Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl): 58.44 g/mol

10 grams NaCl                1 mole
------------------------  x  -----------------------  =  0.17 moles NaCl
                                   58.44 grams

(Step 2)

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

0.17 moles NaCl           6.022 x 10²³ atoms
--------------------------  x  --------------------------------  =  1.03 x 10²³ atoms NaCl
                                                 1 mole

Answer:

Explanation:

Here, we want to get the number of moles

Mathematically:

We have that as: