Question

10 g hydrogen is reacted with 64 g oxygen.The amount of water formed will be (in mole)
(A) 3 (B) 4 (C) 1 (D) 2​

Answer 1

Answer:

first we see reaction by which form water

2H2+ O2--->2H2O

here we see 2mole hydrogen react with 1mole Oxygen form two mole water .

we have

10gm hydrogen =5mole hydrogen

64gm Oxygen =2mol mole oxygen

we know according to above reaction

4gm hydrogen react with 32gm oxygen

so,

10gm hydrogen react with 80gm oxygen but we have given amount of oxygen only 64 gm it means Oxygen is here limiting reagent .

now all oxygen reat then 8gm hydrogen react and form 4mole of water .hence option(b) is correct

hope this help u