Answer to Question #95416 in Chemistry for Kush

Question

Calculate the mass of 1.505 molecules of oxygen gas

Answer 1

First, the number of moles of oxygen gas should be estimated:

n (O₂) = N(O₂) / N_A,

where n - number of moles, N - number of oxygen gas molecules, NA - Avogadro's number.

From here:

n (O₂) = 1505 / 6.022 × 10²³ = 249.92 × 10^-23 moles

The mass of the oxygen gas is:

m (O₂) = M (O₂) × n (O₂),

where m - mass, M - molecular weight, n - number of moles.

From here:

m (O2) = 32 g/mol × 249.92 × 10^-23 moles = 8 × 10^-20 g.

Answer: 8 × 10^-20 g