General Chemistry Answers

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.

What mass of oxygen will react with 7.75g of P4?

What mass of Al(OH)3 is produced if 22.7g of NaOH is consumed?

1. Draw the shell model for Be2+.

1. How many protons, electrons, and valence electrons does it have?

1. How many shells does it have?

1. Draw its Lewis structure.

A system releases 622 kJ of heat and does 105 kJ of work on the surroundings. What is the change in internal energy of the system?

Write the Kc and Kp for the following reactions. indicate whether the equilibrium system is homogeneous or heterogeneous.

a. 2KCIO3 (s) ⇌2KCI (s) + 3O2 (g)

b. 3O2(g) ⇌2O3 (g)

c. Bi2S3 (s) ⇌2Bi3+ (aq) + 3S¯² (aq)

Calculate the standard free-energy change for the reaction at 25 ∘C.

Refer to the list of standard reduction potentials.

2Au3+(aq)+3Mg(s)↽−−⇀2Au(s)+3Mg2+(aq)

Δ𝐺∘= kJ