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GarryVolchara [31]
3 years ago
5

What is the correct mathematical relationship between the number of moles, the volume, and the standard molar volume of a substa

nce?
Chemistry
2 answers:
tekilochka [14]3 years ago
8 0

Answer:

V_{m} = \frac{V}{n}

Explanation:

Molar volume is the volume occupied by 1 mole of a substance.

For gases, based on the ideal gas law we have:

PV = nRT

where, P = pressure, V= volume, n = moles, R = gas constant, T = temperature

\frac{V}{n} = \frac{RT}{P}

Here, the molar volume is given as:

V_{m} = \frac{V}{n}

Under standard temperature and pressure conditions, the molar volume of an ideal gas is 22.4 L/mol

vitfil [10]3 years ago
4 0
The relationship is:
standard molar volume = volume / moles
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People take antacids, such as milk of magnesia, to reduce the discomfort of acid stomach or heartburn. The recommended dose of m
Llana [10]

Answer:

V_{HCl}=0.208L=208mL

Explanation:

Hello,

In this case, since the chemical reaction is:

2HCl+Mg(OH)_2\rightarrow MgCl_2+2H_2O

We can see that hydrochloric acid and magnesium hydroxide are in a 2:1 mole ratio, which means that the neutralization point, we can write:

n_{HCl}=2*n_{Mg(OH)_2}

In such a way, the moles of magnesium hydroxide (molar mass 58.3 g/mol) in 500 mg are:

n_{Mg(OH)_2}=500mg*\frac{1g}{1000mg}*\frac{1mol}{58.3g}  =0.00858mol

Next, since the pH of hydrochloric acid is 1.25, the concentration of H⁺ as well as the acid (strong acid) is:

[H^+]=[HCl]=10^{-pH}=10^{-1.25}=0.0562M

Then, since the concentration and the volume define the moles, we can write:

[HCl]*V_{HCl}=2*n_{Mg(OH)_2}

Therefore, the neutralized volume turns out:

V_{HCl}=\frac{2*0.00858mol}{0.0562\frac{mol}{L} }\\ \\V_{HCl}=0.208L=208mL

Best regards.

3 0
3 years ago
Which is the correct answer? (I already tried to do it)
Jet001 [13]
See if it is telling you to add them lol
4 0
3 years ago
Question 6 *
ycow [4]

Answer:

33 g

Explanation:

Given data:

Number of moles = 5 mol

Mass of compound = 165 g

Molar mass or gram formula mass = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Now we will put the values in formula.

5 mol = 165 g/ gram formula mass

Gram formula mass = 165 g / 5 mol

Gram formula mass = 33 g/mol

7 0
3 years ago
An ordered list of chemical substances is shown:
JulijaS [17]

Answer : The correct option is, (B) 2, 3 and 6.

Explanation :

Combustion reaction : It is a type of reaction where a hydrocarbon react with an oxygen molecule to give carbon dioxide, water as a product.

In general,

Hydrocarbon+O_2\rightarrow H_2O+CO_2

For example : Ethane react with oxygen to give carbon dioxide and water.

C_2H_8+4O_2\rightarrow 2CO_2+4H_2O

In the given list, O_2 is a reactant and CO_2,H_2O are the products.

Therefore, the correct answer is, (B) 2, 3, and 6

6 0
3 years ago
How do you know if a new substance is formed in a chemical equation
S_A_V [24]

<u>Answer:</u> The indicators written will identify a new substance is formed in a chemical equation.

<u>Explanation:</u>

A chemical equation is defined as the equation in which reactants and products are present and are separated by a right arrow.

\text{Reactants}\rightarrow \text{Products}

Indicators of a chemical reaction are:

  • Formation of a precipitate
  • Evolution of gas
  • Formation of bubbles
  • Color change
  • Specific odor
  • Change in temperature

Hence, the indicators written will identify a new substance is formed in a chemical equation.

7 0
3 years ago
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