Chemistry Question 03

Question

When sodium is placed in water, the following chemical reaction occurs.

 

2Na_(s) + 2H₂O _(l) → 2NaOH _(aq) + H_2 (g)

 

If a teacher uses a 0.350 gram sample of sodium (Na) metal for a demonstration with excess water, how many liters of hydrogen (H₂) gas would be produced at STP?

A. - 0.171 L of H₂

B. - 0.682 L of H₂

C. - 0.341 L of H_{2 ( Incorrect... )}

D. - 0.718 L of H₂

Please explain your answer!

Answer 1

What you calculated was the liters of Na. There are half as many moles of hydrogen than sodium based off of the balanced chemical reaction. So the answer should be 0.341 / 2 which gives you choice A