General Chemistry Answers

If a bomb calorimeter is loaded with 0.0125 moles of napthalene and the ΔT during the combustion process is 4.25 K, what is the ΔH_comb (in kJ/mol) assuming the calorimeter constant (C_system) is 10.310 kJ/K?

How many moles of a KOH solution are there in 375mL of 2.45M KOH, and how many grams of KOH do you have

What is the initial volume of a 12.1mol/L hcl solution needed in order 500.0ml of a 2.5 mol/l solution of hcl

1.How is Gibbs free energy change determined when ΔH and ΔS are available?

2. How is free energy change in non-standard states (ΔG) related to the standard free energy change (ΔG°)?

A chemist runs a reaction at 50C and determines its rate to be 0.00451M/s. If she increases the temperature to 80C, what will the rate of the reaction be?

Ozone (O3) in the atmosphere may react with nitric oxide (NO).

O3(g) + NO(g) = NO2(g) + O2(g)

From the following data, calculate the ΔG° in kJ for the reaction at 25°C and determine whether the reaction is spontaneous. ΔH° = -199kJ  ΔS° = -4.1 J/K

Consider the reaction below at 25°C for which ΔS = 16.1 J/K. Show your work.

CH4(g) + N2(g) = HCN(g) + NH3(g)

At what temperature will this reaction be spontaneous?

A 2.65 g sample of a gas occupies a volume of 650 mL at 100°C and 753 torr. What is the molecular weight of the gas? [R = 0.0821 L-atm/mol-K]

1. Calculate the ΔH for the reaction: 

CS2 (l) + 2 O2 (g)  �  CO2 (g) + 2 SO2 (g)

Given: 

ΔHfCO2 (g) = - 393.5 kJ/mol; 

ΔHfSO2 = -296.8 kJ/mol; 

ΔHfCS2 (l) = 87.9kJ/mol

volume of 25 grams of Oxygen gas