Answer:
1.038 x 10²⁴ molecules
Step-by-step explanation:
To find the amount of molecules, you need to multiply the mole value by Avogadro's number. Avogadro's number is a ratio which represents the amount of molecules per every 1 mole. The ratio should be arranged in a way that allows for the cancellation of units (moles should be in the denominator to cancel the units of the given value). The final answer should have 4 sig figs to like the given value (1.723 = 4 sig figs).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
1.723 moles (NH₄)₂SO₄ 6.022 x 10²³ molecules
------------------------------------- x -------------------------------------- =
1 mole
= 1.038 x 10²⁴ molecules (NH₄)₂SO₄