How many grams of NHC will produce from 2.0 g of hydrogen gas

Question

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Answer 1

Hello, Leslie,

I'll add what might be missing from your question and then guide you through the answer. Hopefully, it will help if I didn't get the correct reagents.

My interpretation of the question is:

How many grams of CHN (hydrogen cyanide) will be produced from 2.0 g of hydrogen gas

We aren't given the other reactants, so I'll simply assume pure carbon and nitrogen.

The balanced reaction for this would be:

2C + N₂ + H₂ = 2HCN

Assuming hydrogen is the limiting reagent (the others are in excess of what is required to react with 2 g of hydrogen), we can see the molar ratio of H₂ to HCN is (1 mole H₂)/(2 moles HCN). For each 1 mole of H₂ we can obtain 2 moles of HCN.

We are given 2 g of H₂. Convert this into moles H₂ by dividing by the molar mass of H₂, which is 2.0 g hydrogen/mole hydrogen.

Thus, we have 1 mole of H₂. The molar ratio says we'll get twice that many moles of HCN, so 2 moles of HCN can be produced. We need to convert that into grams HCN, so use the molar mass of HCN (1 + 12 + 14) = 27 g HCN/(mole HCN). Use the units to see what must be done to find grams HCN from moles HCN.

(2 moles HCN)*(27g HCN/mole HCN) = 54 grams HCN

Note how the moles HCN units cancel and we are left with just grams HCN.

Careful, the toxicity of HCN (hydrogen cyanide) is very high (200 parts per million can cause death).

I hope this is the right question, and my explanation is helpful.

Bob