Please help me with questions 1 and 2 thank you !!

The molar relationship says that every 1 mole of an element or compound weighs equal to its molecular weight.

As 1 mole of molecular hydrogen weighs 2 g.

2 moles of molecular hydrogen will weigh

1 mole of molecular oxygen weighs 32 g

1 mole of water weighs = 18g

2 moles of water weigh=

As can be seen from the balanced chemical equation above, 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water.

Thus 4g of combines with 32 g of to give 36 moles of .