Question

The molar mass of H2O is 18.02 g/mol. How many moles of H20 are

present in 2.15 x 10^24 molecules?

Answer 1

To find the number of moles of H2O in 2.15 x 10^24 molecules, divide the number of molecules by Avogadro's number (6.022 x 10^23 molecules/mol).

Step-by-step explanation:

Calculating Mole Quantity from Molecules

To determine how many moles of H2O are present in 2.15 x 10^24 molecules, we start with Avogadro's number, which is 6.022 x 10^23 molecules per mole. This number acts as a conversion factor between molecules and moles. Thus, the number of moles is calculated by dividing the given number of molecules by Avogadro's number:

Moles of H2O = (2.15 x 10^24 molecules) / (6.022 x 10^23 molecules/mol)

After doing the calculation, you would get the number of moles of H2O present in the given number of molecules.

Answer 2

3.57moles

Step-by-step explanation:

The number of moles in a compound can be got from the number of molecules it contains.

Since;

number of moles (n) = number of molecules (nA) ÷ Avagadro's number

Avagadro's number = 6.02 × 10^23 molecules

H20 contains 2.15 x 10^24 molecules, according to this question. Therefore,

n = 2.15 x 10^24 ÷ 6.02 × 10^23

n = 0.357 × 10^(24-23)

n = 0.357 × 10^1

n = 3.57moles

Hence, 3.57moles are present in in 2.15 x 10^24 molecules of H2O.