Question

5. You have 7 moles of NaCl. How many particles are present?

Answer 1

1) List the known and unknown quantities.

Sample: 7 mol NaCl

Particles: unknown

2) Convert moles of NaCl to particles of NaCl.

Avogadro's number is 6.022*10^23

1 mol = 6.022*10^23

$particles\text{ }NaCl=7\text{ }mol\text{ }NaCl*\frac{6.022*10^{23}\text{ }particles}{1\text{ }mol\text{ }NaCl}=4.21*10^{24}\text{ }particles$

7 mol NaCl is equal to 4.21*10^24 parcicles.