Question

What is the mass in grams of 5.25 x 1024 molecules of NaOH?

Answer 1

Answer: The mass is 348.8g

Explanation:

We begin by using Avogadro's number to convert the number of molecules of  Sodium Hydroxide to moles.

6.02 x 10∧23 molecules of NaOH -------> 1 mole of NaOH

∴ 5.25 x 10∧24 molecules of NaOH -------> 1/ 6.02 x 10∧23 x 5.25 x 10∧24 =

                                                                    8.72moles.

Having found the number of moles, we then move from moles to gram by using the molar mass of NaOH (i.e the mass of 1 mole of NaOH).

1 mole of NaOH is equivalent to 40g (Molar Mass)

8.72 moles of NaOH would be equivalent to; 40/ 1  x 8.72 = 348.8g

The mass in 5.25 x 10∧24molecules of NaOH is 348.8g