What is the mass in grams of 1.02X10^24 molecules of NaCl?

1 mole contains 1.02 x 10^23 molecules.

Hence you can calculate the number of moles 1.02 x 10^24 molecules represents.

If you calculate the mass in grams of one mole of NaCl from the atomic masses, you can find the answer.

DrRuss made a typo above; he intended, I'm sure, to write 1 mol contains 6.02 x 10^23 molecules.

Ooops thank you DrBob!

To calculate the mass in grams of a given number of molecules of a compound, you need to follow these steps:

1. Determine the formula of the compound: In this case, the compound is NaCl, where Na represents sodium and Cl represents chlorine.

2. Find the molar mass of the compound: The molar mass is the mass of one mole of a substance. The molar mass of NaCl is calculated by adding the atomic masses of sodium (Na) and chlorine (Cl) together. The atomic mass of sodium is 22.99 grams per mole, and the atomic mass of chlorine is 35.45 grams per mole. Therefore, the molar mass of NaCl is 22.99 + 35.45 = 58.44 grams per mole.

3. Convert the given number of molecules to moles: Avogadro's number states that there are 6.022 × 10^23 molecules in one mole of a substance. To convert 1.02 × 10^24 molecules of NaCl to moles, divide the given number of molecules by Avogadro's number:

Moles = (1.02 × 10^24 molecules) / (6.022 × 10^23 molecules/mol)

Moles = 1.69 moles

4. Calculate the mass in grams: To find the mass in grams, multiply the number of moles by the molar mass:

Mass = (1.69 moles) × (58.44 grams/mole)

Mass ≈ 98.75 grams

Therefore, the mass in grams of 1.02 × 10^24 molecules of NaCl is approximately 98.75 grams.