Question

a gas cylinder contains 320 g of oxygen { atomic mass of oxygen = 16} . find the number of gam present in it . find the number of moles and no of atoms present in it

Answer 1

Answer:

The number of molecules in 16g of oxygen is

We know the formula of mole. Atomic mass of atom is 16g. Which means 1 mole of Oxygen = 16g = 6.022×10^23 numbers of atoms. Since, 32g means 2 mole.

Explanation:

Hope It Helps

Answer 2

Answer:

Explanation:

we know 1 mole of oxygen molecules is equal to 32 grams

(dont confuse between oxygen atom and oxygen molecule.

one mole of oxygen atom =16g but one mole of oxygen molecule=32g because oxygen molecule is diatomic .)

so no of moles in 320g of oxygen gas=320/32=10 moles

now to find the number of oxygen atoms,we know 1 mole of oxygen molecules contain 2*NA(where NA=6.022*10^23)oxygen atoms(as each oxygen molecule contains 2 atoms)

so the number of oxygen atoms in 10 moles (which we have found earlier)of oxygen gas=10*2*6.022*10^23 oxygen atoms=12.044*10^24 oxygen atoms

hope this helps you

thank you