A chemist wants to determine the enthalpy of neutralization for the following reaction: HCI (aq) + NaOH(aq) → NaCl (aq) + H2O (1)
The chemist uses a coffee cup calorimeter to neutralize completely 61.1mL of 0.543 M HCI with
42.6 mL of NaOH. The initial temperature of both solutions is 17.8°C. After neutralization, the
highest recorded temperature is 21.6°C. Calculate the Heat neutralization in kJ/mol of HCl. Assume that
the density and specific heat capacity of both solutions is the same as that of water.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)