How many HNO3 molecules are in 4.20 grams?

4.01x 10 ²² molecules HNO3

Explanation: Solution attached:

Convert mass of HNO3 to moles using its molar mass.

Convert moles of HNO3 to molecules using the Avogadro's number

4.20 g HNO3 x 1 mole HNO3 / 63 g HNO3 x 6.022x10²³ molecules HNO3 / 1 mole HNO3

= 4.0X 10 ²² molecules HNO3

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