Question

Be sure to answer all parts. How many moles of water contain each of the following number of molecules?

Report your answer using appropriate number of significant figures.

a. 9.52 x 1026 molecules
_____ mol

b. 7.81 x 1022 molecules
_____mol

c. 2.5 % 1023 molecules
_____ mol​

Answer 1

N = n x No

No = avogadro's number = 6.02 x 10²³

n = mol

a. 9.52 x 10²⁶ : 6.02 x 10²³ = 1.58 x 10³ (3 sig figs)

b. 7.81 x 10²² : 6.02 x 10²³ = 1.30 x 10⁻¹ = 0.130 (3 sig figs)

c. 2.5 x 10²³ : 6.02 x 10²³ = 0.42 (2 sig figs)

Answer 2

1.520

1.333

15.899

Step-by-step explanation:

its very easy