General Chemistry Answers

In an experiment you have 5 moles of Fe, how many grams of Fe₂O₃ can be produced?

Workout the relative formula mass of the following compounds

(i) Calcium nitrate

(ii) Iron (II) Chloride

(iii) Magnesium sulphate

5.0g of solid zinc carbonate are heated to produce oxide and carbon dioxide. 

(a) Write a balanced chemical equation for the reaction. States are required.

(b) Calculate the mass of carbon dioxide produced in the reaction.

1. How many atoms are present in 54.3 moles of Mg?

The total pressure of an O₂-Ar-He gas mixture is 1893 mmHg. If the partial pressure of Ar is 1100. mmHg and the partial pressure of He is 389 mmHg, what is the partial pressure of O₂

Two flasks are connected with a stopcock. Flask #1 has a volume of 2.5 L and contains oxygen gas at a pressure of 0.70 atm. Flask #2 has a volume of 3.8 L and contains hydrogen gas at a pressure of 1.25 atm. When the stopcock between the two flasks is opened and the gases are allowed to mix, what will the resulting pressure of the gas mixture be?

Two flasks are connected with a stopcock. Flask #1 has a volume of 2.5 L and contains oxygen gas at a pressure of 0.70 atm. Flask #2 has a volume of 3.8 L and contains hydrogen gas at a pressure of 1.25 atm. When the stopcock between the two flasks is opened and the gases are allowed to mix, what will the resulting pressure of the gas mixture be?

What mass of water will be produced from 2.70 moles of Ca(OH)2 reacting with HCl? (Must show work)

CCl 4 , an important commercial solvent, is prepared by the reaction of Cl 2 (g) with a carbon

compound. Determine ΔH o for the reaction:

CS 2 (l) + 3 Cl 2 (g) → CCl 4 (l) + S 2 Cl 2 (l)

Use appropriate data from the following listing.

CS 2 (l) + 3O 2 (g) → CO 2 (g) + 2SO 2 (g) ΔH o = -1077 kJ

2 S (s) + Cl 2 (g) → S 2 Cl 2 (l) ΔH o = -58.2 kJ

C (s) + 2 Cl 2 (g) → CCl 4 (l) ΔH o = -135.4 kJ

S (s) + O 2 (g) → SO 2 (g) ΔH o = -296.8 kJ

SO 2 (g) + Cl 2 (g) → SO 2 Cl 2 (l) ΔH o = +97.3 kJ

C (s) + O 2 (g) → CO 2 (g) ΔH o = -393.5 kJ

CCl 4 (l) + O 2 (g) → COCl 2 (g) + Cl 2 O (g) ΔH o = -5.2 kJ

Which of the following is false?

1. Kw = [OH- ][H+ ]

2. Kw = Ka x Kb 3. pKw = pKa x pKb

4. pKa + pKb = 14

5. None of the above