How many grams of h2 is needed to produce 6,8 grams of ph3

ph4 +h2=ph3
(balance the equation and solve)

p-31 h-1

answer asap im gonna mark you brailniest !

How to convert a density of 0.791g/cm3 to lb/ft3

How many miles of water are produced if 5.43 mol pbo2 are consumed

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?