Question

PLEASE HELP

1-A researcher studying the nutritional value of a new candy places a 3.00-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.55 °C. If the heat capacity of the calorimeter is 37.10 kJ·K–1, how many nutritional Calories are there per gram of the candy?

2-In a constant-pressure calorimeter, 50.0 mL of 0.340 M Ba(OH)2 was added to 50.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 23.68 °C to 28.31 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·K, respectively), what is ΔH for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.

3-If the heat of combustion for a specific compound is -1470.0 kJ/mol and its molar mass is 52.79 g/mol, how many grams of this compound must you burn to release 678.20 kJ of heat?