General Chemistry Answers

How many grams of CO are needed to react with 1.84 mol of Fe2O3? Express the mass in grams to three significant figures.

How many grams of CO are needed to react with 3.32 g of Fe2O3? Express the mass in grams to three significant figures.

How many grams of water is produced when 0.45 moles of oxygen is burned

Within the cylinders of a car’s engine, the hydrocarbon octane (C8H18), one of many components of gasoline, mixes with oxygen from the air and burns to form carbon dioxide and water vapor. Write a balanced equation for this reaction.

How many kilojoules are released when 1.95 mol

of H202 reacts?

1. Solid calcium carbonate is synthesized from calcium oxide powder and carbon dioxide gas.

2. The reaction between calcium carbide (kalburo, CaC2) and water forms acetylene (C2H2) and

calcium hydroxide, Ca (OH)2 .

3. The combustion of the mineral pyrite (FeS2) in oxygen gas produces another mineral hematite

(Fe2O3) and sulfur dioxide.

4. The oxidation of phosphine (PH3) to phosphorus pentoxide (P2O5) is given by the chemical

equation: PH3 + O2 → P2O5 + H2O

5. Thermite welding is an exothermic reaction,which produces molten iron that permanently

binds metals as it cools. The process does not require heat or electricity. Aluminum powder is

simply mixed with ferric oxide powder. The reaction is accompanied by a release of heat, and produces aluminum oxide and molten iron.

If 6.5 gram of magnesium ribbon reacts completely with hydrochloric acid how many grams of H2 will be liberate (H=1,Mg=24)

Find degree of hydrolysis (DOH), hydrolysis constant (Kh) and P

H

of a salt HCOOK

(0.001M). if Ka for weak acid HCOOH is 10-4

.

The reaction between calcium carbide (kalburo, CaC₂) and water forms acetylene (C_{2}*H_{2}) and calcium hydroxide [Ca(OH) 2 ].

What are the empirical and molecular formulas of a compound that is 40.27 % potassium, 26.78 % chromium, and 32.95 % oxygen? The molar mass of the compound is 194.2 g/mol.