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## Problem

Part 1

Calculate the mass of 0.550 moles of NaOH. How many NaOH molecules are there?

Part 2

Calculate the number of moles of 34.5 g of HCl. How many HCl molecules are there?

## Solution

Part 1

First calculate the molar mass of NaOH.

To calculate the number of molecules, simply multiply the number of moles of NaOH with Avogadro's number.

NaOH molecules.

Part 2

First calculate the molar mass of HCl.

of HCl

To calculate the number of molecules, simply multiply the number of moles of HCl with Avogadro's number.

HCl molecules.