Chem multiple choice help?

I am almost certain it is calcium

When calcium is allowed to react with nitrogen, N2, calcium nitride is formed, as shown in the following balanced chemical equation: 3Ca + N2 → Ca3N2

If 24.0 g of calcium and 12.0 g of nitrogen are available for this reaction, the limiting reagent will be

Question options:

a) calcium 

b) nitrogen 

c) calcium nitride 

d) both calcium and nitrogen will be consumed completely 

e) cannot be determined

2 Answers

  • Dr W
    Lv 7
    1 month ago

    compare the ratios of mole / coefficient of reaction for each reactant.  Whichever is lower is the LR

    .. Ca..(24.0g / 3) * (1 mol / 40.1g) = ?

    .. N2. (20.01g / 1) (1mol / 28.02g) = ?

    .. which is lower?

  • 1 month ago

    Just by looking at the amounts, I would guess calcium, since you need 3 moles of Ca per mole of N2. To confirm:

    24.0 g / 40g/mol  = 0.6 mole of Ca

    12 g / 28 g/mol = 0.43 mol

    So you would need 3 x 0.43 = 1.29 moles of Ca to react completely with the N2, so a. is the answer.

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