Question

When 25.0 mL of 0.700 mol/L NaOH was mixed in a calorimeter with 25.0 mL of 0.700 mol/L HCl, both initially at 20.0 °C, the temperature increased to 22.1 °C. The heat capacity of the calorimeter is 279 J/°C. 

Since the solutions are mostly water, the solutions are assumed to have a density of 1.0 g/mL and a specific heat of 4.18 J/g°C. 

What is the mass of the solution? 

Select one:

a. No enough information

b. 50.0 g

c. 50.0 kg

d. 25.0 g

Answer 1

Volume of the total solution = 25 ml + 25 ml = 50 ml

Density of the solution = 1.0 g/ml

Mass of the solution = 50 gm

Hence Option A is correct answer.