Question

From 200 mg of co2, when x molecules are removed
2.89 * 10-3moles of co2, are left x will be
(1) 1020 molecules (2) 1010 molecules
(3) 21 molecules (4) 1021 molecules​

Answer 1

no of moles of co2 in 44g of co2 =1

1g of co2 =1/44