Chemistry Answers

HG is a hypothetical weak acid. given that the pH at the equivalence point for the titration between 0.073 M potassium hydroxide and 20.0ml of 0.046 M HG is 10.44 calculate the base dissociation constant of G

What mass of coppef would you be able to raise from 92 C to 192 C py applying 4.100 joules of heal?

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

1. The 0.0005 mol/l K3[Fe(CN)6] solution was used for determination of a coagulation threshold of a sol. The minimal amount of the solution required for the coagulation of 9 ml of the sol was found to be 1 ml. Calculate the coagulation threshold of the sol.

The neutralization reaction between hydrochloric acid (HCI) and calcium hydroxide [Ca(OH)2] produces calcium chloride )CaCl2) and water.

2hCl(aq) + Ca(OH)2(s) 🠖 2H2O(l) + CaCl2(aq)

If 0.75 grams of Ca(OH)2 is used in the reaction, determine the following:

a. Mass of HCl (MW=36.64 g/mol)needed to completely react with Ca(OH)2. The molar mass of Ca(OH)2 is 74.10 g/mol.

b. Mass of CaCl2 is (MW=110.98 g/mol) formed in the reaction.