A scientist uses 3 g of water (H2O) in an experiment. Which option describes the first step in calculating the number of molecules in 3 g of water?(1 point)

Question

A scientist uses 3 g of water (H2O) in an experiment. Which option describes the first step in calculating the number of molecules in 3 g of water?(1 point)
Responses

Determine the molar mass of water.
Determine the molar mass of water.

Calculate the number of moles of water.
Calculate the number of moles of water.

Identify the molar masses of H and O.
Identify the molar masses of H and O.

Apply Avogadro's number, 6.022×1023
.
Apply Avogadro's number, 6 point 0 2 2 times 10 to the 23th power.

GPT-4o mini · Answer

The first step in calculating the number of molecules in 3 g of water is to determine the molar mass of water.

This is because you need to know the molar mass in order to convert grams to moles, which is necessary for subsequently calculating the number of molecules using Avogadro's number.