Question

A student wishes to measure the heat transfer when 1.128 g of sodium hydroxide is dissolved in 200.0 mL of water. How many joules of energy are absorbed or released during the salt dissolving if the temperature of the solution increases 1.5 K?

Answer 1

To calculate the heat transfer when NaOH is dissolved in water, use the equation q = m * C * ΔT. Calculate the moles of NaOH dissolved using the molar mass, then use the molar heat of solution to find the heat transfer in joules. The change in temperature can be found using the equation ΔT = final temperature - initial temperature.

Step-by-step explanation:

To determine the heat transfer when sodium hydroxide (NaOH) is dissolved in water, we can use the equation for heat transfer, q = m * C * ΔT, where q is the heat transfer, m is the mass of the solution, C is the specific heat capacity of the solution, and ΔT is the change in temperature.

In this case, we have 1.128 g of NaOH and 200.0 mL of water. Using the molar mass of NaOH (22.99 g/mol), we can calculate the moles of NaOH dissolved. Then, using the given molar heat of solution for NaOH (-44.51 kJ/mol), we can calculate the heat transfer in joules.

To determine the change in temperature, we can use the equation ΔT = final temperature - initial temperature. In this case, the temperature of the solution increases by 1.5 K.