Chemistry Answers

write the rate equation

a lead fishing weight contains 0.85mol of lead atoms. what is its mass?

100 g of manganese dioxide reacts with 300 g of hydrochloric acid in the reaction shown below.

MnO2 + 4HCl -> MnCl2+ 2H2O + Cl2 

 (Use the following molar masses: MnO2= 86.9g/mol HCl = 36.5g/mol ; MnCl2= 125.8g/mol; H2O= 18.02g/mol and Cl 2 =70.9 g/mol.

 a. Which reactant is limiting?

b. Which reactant is excess? 

c. What is the theoretical yield of Cl2? 

d. What is the percent yield of the reaction if 75.0 g of Cl2 was produced

How many moles of FeCl2 are produced when 16 grams of Fe reacts with HCl?

33. Consider the following reaction : CO(g)+2H 2 (g) CH 3 OH(liq.) Given : Delta f G^ (CO)=-137 kJ.mol^ -1 , Delta f G^ (CH 3 OH)=-166 kJ.mol^ -1 Calculate Delta_{r}*G at 25 degrees * C for the following pressures : P(CO) = 5 atm and P(H_{2}) = 3atm .

Carbonic acid ionizes in water to produce hydronium and bicarbonate ions. It can also decompose into carbon dioxide and water. With this information, explain why drinking carbonated drinks, like soft drink, results in burping.

Draw the Lewis structures of the following ions giving all the steps.

(i) S2

2- (ii) OCl- (iii) CN

Acetone, C3H6, is the main ingredient of nail polish remover. A solution is made up

by adding 35.OmL of acetone (d=0.790g/mL) to 50.0mL of ethyl alcohol, C2H60

(d=0.789g/mL). Assuming volumes are additive, calculate (a) the mass percent of

acetone in the solution. (b) the volume percent of ethyl alcohol in the solution. (c) the

mole fraction of acetone in the solution.

Calculate the gross calorific value of coal

having the following composition: C= 80%, H = 85-10-3%, N=1% and ash = 7% using Dulong's formula

In a titration, you found that 50.0ml HCl solution requires 25.00ml of 1.00M NaOH. What is the concentration of the hydrochloric acid solution?