Question

Liquids and solids are left out of the equilibrium constant expression because their concentrations remain constant during reactions. What is the molarity concentration of liquid water at 25.0 LaTeX: ^\circ ∘C given that its density is 0.997 g/mL at that temperature?
a.23.5 M
b.0.997 M
c.0.180 M
d.0.156 M
e.55.3 M

Answer 1

Answer:

55.3 M

Explanation:

Given temperature = 25°C

Density = 0.997 g/mL

Based on density the mass of water per L = 997 grams

The molar mass of water = 18

The moles of water = $\frac{mass}{molarmass}=\frac{997}{18}=55.3$

The molarity is defined as the moles of water per litre.

The moles = 55.3

Volume = 1 L

So molarity = 55.3 /1 = 55.3 M