1.50g of NaNO3 is dissolved into 25.0mL of water, causing the temperature to increase by 2.2°C. The density of the final solution is found to be 1.02g/mL. Which of the
following expressions will correctly calculate the heat gained by the water as the NaNO3 dissolves? Assume the volume of the solution remains unchanged.

it should be all of them because it asks if you included all of those in your answer

explanation:

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

the answer is c i took the test