Question

2. If 90.0 grams of sodium is dropped into 40.0 grams of water, what is the yield of hydrogen gas in grams?​

Answer 1

2.96 g

Explanation:

Here H2O is limiting reactant so whole 90 gm of sodium doesn't react. Only 32.59 g of sodium reacts with 40 g of water to give 2.96 g of hydrogen.