General Chemistry Answers

Consider the following unbalanced chemical equation:

H

2

O(l)→H

2

(g)

electricalcurrent

+O

2

(g)

H2O(l)→H2(g)electricalcurrent+O2(g)

A chemistry student tries to balance the equation by placing the subscript 2 after the oxygen atom in H

2

O

H2O.

What is the final pressure inside a scuba tank after it cools from 25°C to -10°C? The initial pressure in the

tank is 130 atm. 

Calculate the entropy change when graphite burns insufficient supply of oxygen as to graphite has 5.7J/molK, O2 has 205J/molK and CO2 has 213.6J/molK

Balance the following equations.

1. Fe + O2 → Fe2O3

2. CS2 + Cl2 → CCl4 + S2Cl2

3. Fe + H2O → Fe3O4 + H2

1. The empirical formula of a compound of Carbon and Hydrogen is CH2. Its molar mass is 100g/mol. Determine the molecular formula of the compound.

Solve the ff problem. Refer to the given mass numbers in computing for the molar mass.

Molar Numbers:

Fe= 55.85

O=16

C=12.01

S=32.07

Cl=35.45

H=1.01

2. In a certain experiment 30.0g CS2 is used in the reaction. The experiment is performed and CCL4 is collected and its mass is found to be 16.3g. What is the percentage yield for the reaction?

Calculate the molality of a 6.55 kg sample of a solution of the solute CH 2 Cl 2 dissolved

in the solvent acetone (C 3 H 6 O) if the sample contains 876 g of methylene chloride

What is the electron configuration, noble gas configuration, and orbital diagram of potassium?

What is the electron configuration, noble gas configuration, and orbital diagram of chlorine?

What is the electron configuration, noble gas configuration, and orbital diagram of phosphorous?