Question

Calculate the number of gram atoms present in the following masses:-
i) 64g of oxygen
ii)140g of nitrogen​

Answer 1

Answer:

gram atoms = moles

Moles = Given mass / Molar mass

1) moles= 64 /16

= 4 moles

2) moles = 140/14

= 10 moles

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Answer 2

Answer:

i) molar mass of oxygen is 16g, it means that 1 mole oxygen weighs 16g of oxygen=64/16=4 mole

1 mole of any element contain 6.022*10^23 atom in it.