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!

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i dont know

explanation:

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6