Question

I need help. Please be honest

Answer 1

Mass of Oxygen : 8.0 g

Further explanation

Given

1.51 x 10²³ molecules of Oxygen(O₂)

Required

Mass of Oxygen

Solution

1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)

Can be formulated :

N = n x No

n = moles

No = Avogadro's number

Find moles of Oxygen :

n = N/No

n = 1.51 x 10²³ / 6.02 x 10²³

n = 0.251

Mass of Oxygen :

mass = mol x MW O₂

mass = 0.251 x 32 g/mol

mass = 8.032≈ 8.0 g