Question

What mass C12 will contain the same number of atoms as in 3.6g of O16?

Answer 1

$\mathbb{\bold{ANSWER}}$

Mass of C₁₂ needed = 2.7g

$\mathbb{\bold{EXPLANATION}}$

Given mass of O₁₆ = 3.6g

We know that,

Atomic mass of C₁₂ = 12g

Atomic mass of O₁₆ = 16g

Also,

Number of moles = Given mass / Molar mass

Therefore,

Number of moles of C₁₂ = Number of moles of O₁₆ = n

Number of moles of C₁₂ = Given mass of C₁₂ / Molar mass of C₁₂

n = W / 12

Number of moles of O₁₆ = Given mass of O₁₆ / Molar mass of O₁₆

n = 3.6/16

n = 0.9/4

Therefore,

W / 12 = 0.9/4

W = 0.9 × 12 / 4

W = 0.9 × 3

W = 2.7g