Question

Calculate the number of moles present in: 3.011 X 10^23 number of oxygen atoms. 60 g of calcium

Answer 1

Explanation:

We know, 1 mol of any substance contains 6.022 × 10²³ no of particles.

6.022×10²³ atoms are present in 1 mol of oxygen.

1 atom is present in 1÷6.022×10²³ mol of oxygen.

3.011×10²³ atoms are present in (1÷6.022×10²³) × 3.011×10²³ mol of oxygen.

= 0.5 mol of oxygen[Answer]

Answer 2

Given: $3.011×10^{23}$ number of oxygen atoms.

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

Solution:

To determine the number of moles we have to follow the below steps-

The atomic weight of an oxygen atom is 16 grams.

We know that $6.022×10^{23}$ number of oxygen atoms are present in one mole of the oxygen atom.

Thus $3.011×10^{23}$ number of oxygen atoms will present in

$\frac{3.011 \times {10}^{23} }{6.022 \times {10}^{23} } \\ = .5$

The result is 0.5.

Thus number of moles is 0.5.