# MCQ Chemistry?

5. How many hydrogen atoms are in one mole of ethanol, C2H5OH?

A. 1.00×1023

B. 3.61×1024

C. 5.00

D. 6.00

6. What is the coefficient for H2SO4(aq) when the following equation is balanced, using the

smallest possible integers?

__Mg3N2(s) + __H2SO4(aq) → __MgSO4(aq) + __(NH4)2SO4(aq)

A. 1

B. 3

C. 4

D. 7

### 2 Answers

- electron1Lv 71 year agoFavourite answer
As you look at the formula of ethanol, you can see 6 H’s. This means that one molecule of ethanol contains six hydrogen atoms. To determine the number of hydrogen atoms in one mole of ethanol, multiply the Avogadro’s number by 6.

N = 6 * 6.02 * 10^23 = 3.6 * 10^24

B is the correct answer.

6. What is the coefficient for H2SO4(aq) when the following equation is balanced, using the

smallest possible integers?

__Mg3N2(s) + __H2SO4(aq) → __MgSO4(aq) + __(NH4)2SO4(aq)

Mg3N2 + H2SO4 → MgSO4 + (NH4)2SO4

To balance the Mg’s, make 3 MgSO4.

Mg3N2 + H2SO4 → 3 MgSO4 + (NH4)2SO4

To balance the N’s, make 2 (NH4)2SO4

Mg3N2 + H2SO4 → 3 MgSO4 + 2 (NH4)2SO4

The right side of this equation has four sulfate ions and eight hydrogen atoms. To balance this equation, make four sulfuric acids.

Mg3N2 + 4 H2SO4 → 3 MgSO4 + 2 (NH4)2SO4

C is the correct answer. I hope this is helpful for you.

- davidLv 71 year ago
5. How many hydrogen atoms are in one mole of ethanol, C2H5OH?

5 + 1 = 6

6 X 6.022x10^23 = 3.613x10^24 atoms of H

... so B is correct.

now you try the other question -- my rule, 1 answer per post.