Question

Calculate the no of molecules in .25 g of oxygen

Answer 1

Answer:

0.78

Explanation:

n= w÷M

n = 25÷32

n=0.78

Answer 2

Explanation:

no.of moles =given mass /molar mass

here. given=0.25g

then. mm of oxygen is 32g (O2)

0.25÷32=0.0078125 mol