Question

3g of h2 react with 29g of o2 to give water the amximum amount of h2o formed is

Answer 1

From the above equation it is clear that 2 mole H2 react with 1 mole O2

Molar mass of H2 = 2g

Molar mass of O2= 32 g

This implies, 

4 g H2 react with  32 g O2

3 g  H2 reacts with = (32/4) x 3g of O2 gas

= 24 g

As the given amount of O2 is more than required therefore O2 is excess reagent and H2is limiting reagent. 

B.

2 mole of hydrogen gas reacts to form 2 mole of water molecule therefore,

4 g of H2 produces = 36 g of water 

So the amount of H2O produced by 3 g H2 = (36/4) x 3

= 27 g

Hence, 27 g of water will be produced during the recation

C.

As, 24 g of oxygen has been utilised during the recation and 29 g of oxygen was supplied therefore amount of oxygen gas left is (29-24) = 5g