What is the mass of 8.50 × 10²² molecules of NH₃?

Question

Quizplus · Accepted Answer

To calculate the mass of the given number of molecules of NHSUB13UB0, we need to first calculate the molar mass of the compound, and then use it to convert the given number of molecules into grams.

The molar mass of NHSUB13UB0 can be calculated as follows:

N (1 x 14.01 g/mol) + H (1 x 1.008 g/mol) + S (1 x 32.06 g/mol) + UB (13 x 10.81 g/mol) + B (1 x 10.81 g/mol) + O (1 x 15.99 g/mol) = 233.74 g/mol

Now, to calculate the mass of 8.50 x 10^22 molecules of NHSUB13UB0, we can use the following equation:

mass = number of molecules x molar mass / Avogadro's number

mass = 8.50 x 10^22 x 233.74 g/mol / 6.022 x 10^23 molecules/mol

mass = 2.40 g

Therefore, the correct answer is C) 2.40 g.

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