Question

calculate the number of moles in 17g of h2o

Answer 1

Explanation:

Atomic mass of H = 1.

Atomic mass of O = 16.

Molecular mass of H2O2= (2 × 1) + (2 × 16) = 34 gm.

Since 34 gm of hydrogen peroxide (H2O2) = 1 mole.

Hence 17 gm of H2O2 = 1/ 34 ×17 = 1/ 2 = 0.5moles.

Answer 2

Given: 17 grams of water.

To find: We have to find the number of moles.

Solution:

The chemical formula of water is $H_2O$.

The atomic weight of H is 1 and Oxygen is 16 grams.

Water has two H and one oxygen atom.

Thus, the molecular weight of water is 1×2+16=18 grams.

Thus we can write-

18 grams of water occupy 1 mole.

So, 17 grams of water will occupy 17/18=0.94 moles.

Thus 17 grams of water have 0.94 moles.