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

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  • 6 months ago
    Favorite 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.

    • electron1
      Lv 7
      6 months agoReport

      I want to thank you for choosing my answer as the best answers.

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  • david
    Lv 7
    6 months 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.

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