An impure sample of calcium carbonate (CaCO3) contains calcium sulfate as an impurity. When excess hydrochloric acid was added to
6g of the sample(CaCO3), 1200cm3 of gas (CO2) were produced
(measured at r. t.p.).
Calculate the percentage purity of the calcium carbonate sample.

n impure sample of calcium carbonate (CaCO3) contains calcium

sulfate as an impurity. When excess hydrochloric acid was added to

6g of the sample(CaCO3), 1200cm3 of gas (CO2) were produced

(measured at r.t.p.).

Calculate the percentage purity of the calcium carbonate sample.

Explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

the answer would be b i believe