6) how many grams of oxygen are in 3.50 moles of h₂o? a. 6.02 x 10²³ molecules b. 1.75 x 10²⁴ molecules c…

6) how many grams of oxygen are in 3.50 moles of h₂o? a. 6.02 x 10²³ molecules b. 1.75 x 10²⁴ molecules c. 3.50 x 10²³ molecules d. 2.11 x 10²⁴ molecules e. 2.11 x 10²³ molecules

6) how many grams of oxygen are in 3.50 moles of h₂o? a. 6.02 x 10²³ molecules b. 1.75 x 10²⁴ molecules c. 3.50 x 10²³ molecules d. 2.11 x 10²⁴ molecules e. 2.11 x 10²³ molecules

Answer

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains $6.02\times 10^{23}$ molecules.

Step2: Calculate the number of molecules in 3.50 moles of $H_2O$

We use the formula $N = n\times N_A$, where $n = 3.50$ moles and $N_A=6.02\times 10^{23}$ molecules/mol. So $N=3.50\times6.02\times 10^{23}=2.11\times 10^{24}$ molecules.

Answer:

D. $2.11\times 10^{24}$ molecules