Answer:
3.51 x 10²¹ molecules H₂O
Step-by-step explanation:
To find the amount of molecules in the sample, you need to multiply the amount of moles by Avogadro's Number. Avogadro's Number is a ratio comparing the amount of molecules per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 3 sig figs like the given value (0.00583 = 3 sig figs).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
0.00583 moles H₂O 6.022 x 10²³ molecules
-------------------------------- x -------------------------------------- = 3.51 x 10²¹ molecules
1 mole