If 7.50 × 10²⁴ molecules of a substance have a mass of 454 g, what is the molar mass of the substance?

Question

Quizplus · Accepted Answer

To find the molar mass, we need to use the formula:

molar mass = mass / number of moles

To find the number of moles, we need to divide the given number of molecules by Avogadro's number:

number of moles = number of molecules / Avogadro's number

Avogadro's number is approximately 6.022 × 10^23, so:

number of moles = 7.50 × 10^11 / 6.022 × 10^23
number of moles = 1.248 × 10^-12

Now we can use the formula for molar mass:

molar mass = 454 g / 1.248 × 10^-12 mol
molar mass = 3.65 × 10^14 g/mol

This is equivalent to 36.5 g/mol, so the answer is D.

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