Question

How many grams of water (h_2o) have the same number of oxygen atoms as 1.0 mol of oxygen gas?

Answer 1

Explanation:

1 mole of O2 has 6.022*10²³ atoms

for that also 2 moles of of h2o is required that mean 2*18= 32g/mole=

$\frac{32}{6.022 \times 10 {}^{23} }$

5.314*10^-23

Answer 2

mass of water = 36 grams

given, molecular formula of oxygen gas = O₂

so no of moles of oxygen atoms = 2 × 1 mol = 2 mol.

no of oxygen atoms = 2mol × 6.023 × 10²³ = 12.046 × 10²³

a/c to question, number of oxygen atoms in water = number of oxygen atoms in oxygen gas.

⇒numner of oxygen atoms in water = 12.046 × 10²³

⇒numner of moles of oxygen in water = 12.046 × 10²³/6.023 × 10²³ = 2mol

we know, in one mole of water (H₂O) , one mole of oxygen atoms present.

so, number of moles of water = 2 moles.

mass of water = 2 moles × molar mass of water

= 2mol × 18g/mol

= 36 grams.