Question

How many moles (of molecules or formula units) are in each sample?

Answer 1

The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles

What is the number of moles?

The number of moles of a substance is the ratio of the mass of the substance to the molar mass.

In other words; mole = mass/molar mass.

Thus:

• moles of 18.0 g $NO_2$ = 18.0/46

                                   = 0.391 moles

• moles of 1.35 kg $CO_2$ = 1350/44

                                         = 30.7 moles

• moles of 46.1 g $KNO_3$ = 46.1/101.1

                                          = 0.456 moles

• moles of 191.8 kg $Na_2SO_4$ = 191800/142

                                                 = 1350 moles

More on the number of moles of substances can be found here: brainly.com/question/1445383

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