Question

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?

Answer 1

1.96g H2

Step-by-step explanation:

P4 = 123.9g/mol

H2 = 2.02g/mol

`(20g P_(4) )/(1)` *
`(1 mol P_(4) )/(123.9g)` *
`(6 mol H_(2) )/(1 mol P_(4) )` *
`(2.02g H_(2) )/(1 mol H_(2) )` = 1.96g H2