Question

Mole number
Oxygen 40gram

Answer 1

$\bold{Since\:we\:know\:that,} \\ \\ \bold{\tiny{Atomic\:mass\:of\:O (Oxygen\:atom) = 16\:g{mol}^{-1}}} \\ \\ \bold{\tiny{Atomic\:mass\:of\:O_2 (Oxygen) = 16 \times 2}} \\ \\ \bold{= 32\:g{mol}^{-1}} \\ \\ \bold{Since\:we\:know\:that,} \\ \\ \bold{No.\:of\:moles = \frac{W\:in\:g}{W\:in\:g{mol}^{-1}}} \\ \\ \bold{Here\:weight\:in\:gram\:is\:40\:g} \\ \\ \bold{So,} \\ \\ \bold{No.\:of\:moles=\frac{40\:g}{32\:g{mol}^{-1}}} \\ \\ \bold{Number\:of\:moles=1.25}$

Answer 2

Hey⭐

Understanding Moles

A mole is a huge number used to measure atoms. It is equal to the number of atoms in 12 grams of carbon-12, which is approximately 6.022 x 1023 atoms. Just as it's easier to measure intergalactic.

Oxygen's atomic weight is 16.00 amu.

1 mole of oxygen is 6.02 x 1023 atoms of oxygen 1 amu = 1.661 x 10-24g

What is the molar mass (g/mole) of oxygen?

Molar mass (in grams) is always equal to the atomic weight of the atom.