Use the following balanced reaction to solve 1-3: P4 (s) + 6H2 (g) → 4PH3 (g)

1. How many grams of Hydrogen gas (H2) will be needed to react with 20 grams of P4?

2. How many grams of phosphorus trihydride will be formed by reacting 60 L of Hydrogen gas with an excess of P4?

3. What is the % yield if 350 grams of PH3 gas are formed using 100 g of P4 and an unlimited amount of Hydrogen gas? [ hint: calculate the theoretical yield first]

I NEED HELP!