An instrument used to measure the mass of an object?

What is the mass of each element in a 324.8 sample of co2

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?