What is the volume of the liquid in the this diagram?
Would it be 37 mL or 36.5 mL?

The most important thing to remember about tritium sights is that they gradually lose their effectiveness over time. Tritium has a half-life of about 12.5 years, so tritium sights will only be half as bright in a little more than a decade.

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The balanced chemical equation for the reaction between strontium and oxygen can be written as follows: 2 Sr (s) + \(O_2\)(g) → 2 SrO (s).

In this equation, solid strontium (Sr) reacts with gaseous oxygen (\(O_2\)) to produce solid strontium oxide (SrO).

To determine the mass of product expected to form in this reaction, we need to consider the molar ratio between strontium and strontium oxide. From the balanced equation, we can see that 2 moles of strontium react to produce 2 moles of strontium oxide.

The molar mass of strontium (Sr) is 87.62 g/mol, and the molar mass of strontium oxide (SrO) is 119.62 g/mol. Since the molar ratio is 1:1 between strontium and strontium oxide, the mass of strontium oxide formed will be equal to the mass of strontium used.

In this case, the student added 4.93 g of strontium to the crucible. Therefore, the expected mass of strontium oxide formed will also be 4.93 g.

It's important to note that this calculation assumes that the reaction proceeds to completion, meaning that all of the strontium reacts with oxygen. In actual laboratory conditions, the yield of the reaction may be less than 100% due to factors such as incomplete reaction, side reactions, or product loss.

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Answer:

Ptotal=P1+P2+… +Pn. + P nExplanation:

its c

Answer:

The answer is

Explanation:

To find the number of entities or particles given the number of moles of a substance we use the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

n = 3.4 mol

We have

N = 3.4 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

B, 2.22×10^22 molecules

Explanation:

Given PV=nRT, n=PV/RT

n=103.7×1.0/8.314×(65+273.15)

= 0.0368858... moles

Given n= number of particles/avogadros number

number of particles=n×avogadros number

number of particles = 0.03688...×6.02x10^23

= 2.22×10^22 molecules

Answer:

B) 10.1g

Explanation:

Answer:

10.1 g

Explanation:

Answer: 86,

α-decay

Explanation:

Answer:   a.b.d

Explanation:

Answer:

A)There is no rainbow-like halo around the image. Yes

B)Reflecting telescopes can be made very large. Yes

C)Reflecting telescopes use only lenses, not mirrors. No

D)Only the reflecting side of the primary mirror needs to be perfectly shaped and smooth. Yes

E)The eyepiece creates an image for the observer. No

Answer:

Option D

Explanation:

Because we know the relationship between no of moles and volume

Option D

The pH value of 500 mL of an aqueous solution of 0.005 mole HCl is 2

We'll begin our calculations by obtaining the molarity of the solution. Details below:

Molarity = mole / volume

Molarity = 0.005 / 0.50

Molarity = 0.01 M

Next, we shall obtain the concentration of the hydrogen ion, H⁺ in the solution. Details below:

HCl(aq) <=> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

0.01 M HCl will also contain 0.01 M H⁺

Thus, the concentration of the hydrogen ion, H⁺ in the solution is 0.01 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log H⁺

pH = -Log 0.01

pH = 2

Thus, we can conclude that the pH of the solution is 2

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Answer:

Chronic diseases are defined broadly as conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living or both. Chronic diseases such as heart disease, cancer, and diabetes

Answer:

conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living

Explanation:

Answer:

47.01 °C

Explanation:

Q = mcΔt

Mass of water = 2470g

c or specific heat capacity of water = 4.18 J °C g

Q = 5.47 x 10⁵ J, which is expanded 547,000 J

No idea what Δt is, but we do know the water began to boil, and we know that water's boiling point is 100°C, so the final temperature had to be 100°C.

547,000 J = (2470) x (4.18) x (Δt)

Rearrange equation for Δt

(547,000) / (2470 x 4.18) = Δt

Δt = 52.98°C

But we're not done. We're trying to find the INITIAL TEMPERATURE of the water, not the TEMPERATURE CHANGE. We already have the final temperature, which is 100°C, and now we have how much the initial temperature rose by to get to 100°C.

All that we have to do now is 100 - 52.98 = 47.02°C

The initial temperature of the water is 47.02°C

Answer:

c or b

Explanation:

the story is entertaining and it shares the teachers personal experiences with the teachers students

Answer:

\(\large \boxed{\mathrm{subscripts}}\)

Explanation:

Subscripts are numbers written after elements, subscripts indicate how many of each atom there are in a compound.

The atoms of each element in an compund is written in the subscript. The number of atoms present in any compound whether made up of only same element or different element is termed as Atomicity.

Given compound = \(\boxed{\sf{H_2O}}\)

Here, there are two atoms of hydrogen and one atom of oxygen, So ratio of the atoms of elements in Water molecule = 2 : 1

━━━━━━━━━━━━━━━━━━━━

Answer:

42.39, 64.06

Explanation:

Formula Weight can be calculated by adding the atomic mass of the elements in the formula.

LiCl

AM for Li is 6.94 amu, AM for Cl is 35.45 amu

\((6.94)+(35.45)=42.39\)

SO₂

AM for S is 32.06 amu, AM for O is 16 amu

\((32.06)+2(16.00)=64.06\)

The mass of an iridium sample which absorbs 895J of energy when its temperature increases by 12.3°C is 234.72g.

The mass of a substance can be calculated using the following calorimetry equation:

Q = mc∆T

Where;

According to this question, an iridium sample absorbs 895J of energy when its temperature increases by 12.3°C. The mass can be calculated as follows:

895 = m × 0.310 × 12.3

895 = 3.813m

m = 234.72g

Therefore, 234.72g is the mass of the iridium sample.

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Answer:

Solid

Explanation:

Cus its solid, take a brick for example. It's hard and has no space unlike liquid or gas.

Answer    1 mole = 6.02 × 1023 atoms

0.25 moles × (6.02 × 1023) = 1.5 × 1023 atoms Carbon

for the first one

Explanation:

First, you need to balance the equation:

N2    +  3 H2   ====>    2  NH3

                  so three moles of H2   result in  2 moles of NH3

                               ratio of   3:2

How many moles of NH3 is 36.5 gm  ??

   Using periodic table NH3 mole weight = 14.007  + 3*1.008 =17.031 g/mole

     36.5 g / 17.031 g/mole = 2.14 moles  of NH3

Using the ratios above   3/2 = x / 2.14   shows x = 3.21 moles of H2 needed

The systematic name of the compound is 2,2,3,3-tetramethylbutane.

The parent chain in this compound consists of four carbon atoms, indicated by the central chain of Cs in the diagram you provided. The prefix "but" in the name indicates that there are four carbon atoms in the parent chain.

The four methyl groups are attached to different carbon atoms in the parent chain. We can indicate the position of each methyl group by numbering the carbons in the parent chain. In this case, we can number the carbons starting from the left side of the parent chain, so that the first methyl group is attached to the second carbon, the second methyl group is attached to the third carbon, the third methyl group is attached to the second-to-last carbon, and the fourth methyl group is attached to the last carbon. This gives us the substituent groups 2,2,3,3-tetramethyl-.

Finally, we combine the parent chain name and the substituent groups to get the full name: 2,2,3,3-tetramethylbutane.

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Answer:

Explanation:

Number of moles of Cl atoms in 1.20 1024 Formula units of magnesium chloride mgcl2

The number of moles of Cl is twice as much, because the ratio of Cl in MgCl2 to MgCl2 is 2:1. Therefore, there are 12 moles of Cl. There are 7.22×1024 atoms Cl in 3.61×1024 formula units of MgCl2

The number of grams in 4.26 × 10²⁴ formula units of MgCl₂ is equal to 673.06 grams.

Mass of any substance from moles will be calculated by using the below equation as:

n = W/M, where

W = given mass

M = molar mass

And relation between moles and atoms per moles is:

In 1 moles = 6.022 × 10²³ atoms are present

Given number of atoms of MgCl₂ = 4.26 × 10²⁴

Moles of MgCl₂ = 4.26 × 10²⁴atoms / 6.022 × 10²³ atoms/mol = 7.07 mol

Non we convert this moles of MgCl₂ into grams by using the above given formula as:

W = (7.07mol)(95.2g/mol) = 673.06 g

Hence required mass of MgCl₂ is 673.06g.

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Answer:

Prob because you ugly as hell or you don't have money.

Explanation:

don't worry about girls man, get your bag up.

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

cells -> tissues -> organs -> organ system

Answer:

Cells > tissues > Organs > Organs Systems

Explanation:

tissues are made of a group of cells

a specific organ is made up of a geoup of specific type of tissues

and a group of organs make up the organs system

To break all the bonds in one mole of molecules with a bond dissociation energy of 1 eV, we would require around 5.80 x \(10^{26}\) kJ of energy.

The bond dissociation energy of 1 eV is roughly 96.485 kJ/mol. To break all the bonds in one mole of molecules (6.023 x \(10^{23}\) molecules), we would need to multiply the bond dissociation energy by Avogadro's number:

96.485 kJ/mol x 6.023 x \(10^{23}\) molecules/mol = 5.80 x \(10^{26}\) kJ/mol

Bond dissociation energy is the amount of energy necessary to break a chemical connection between two atoms. It is also known as bond energy or bond enthalpy. This energy is measured in kilojoules per mole (kJ/mol) and is released when the bond forms. The energies of bond dissociation can vary greatly depending on the type of bond being broken.

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The source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.

Citable sources are those sources that are gotten from places that are proven to be of good standards and not from mere claims such as:

Therefore, the source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.

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Answer:

200.0lg

Explanation:

please give a brainliest

Answer:

imp not sure but i think the density is 5  

Explanation:

im probably wrong but i think this because the water rose to the 50 ml mark when before it was 45 then again i am only in 8th grade but it makes sense to me