Question

1.Ammonium perchlorate NH4 ClO4 is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas N2, chlorine gas Cl2, oxygen gas O2, water H2O, and a great deal of energy. What mass of chlorine gas is produced by the reaction of 4.49 g of ammonium perchlorate?

2.This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining):NiCO4

A chemical engineer has determined by measurements that there are 82.moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?

3.A chemist adds 235.0 mL of a 1.55 x 10−5/μmolL silver(II) oxide AgO solution to a reaction flask. Calculate the mass in micrograms of silver(II) oxide the chemist has added to the flask. Round your answer to 3 significant digits

Answer 1

Ans. The balanced chemical reaction is

From the balanced chemical equation, you can see that 2 mol of NH₄ClO₄ gives 1 mol of Cl₂.

Therefore, 1 mol of NH₄ClO₄ will give half mol of Cl₂

Mass of ammonium perchlorate = 4.49g

Molar mass of ammonium perchlorate = 117.49g/mol

No. of mol of ammonium perchlorate is

0.0382 mol of NH₄ClO₄ will give no. of mol of Cl₂ given by

Therefore, 0.0191 mol of Cl₂ will be produced.

Molar mass of Cl₂ = 70.90g/mol

Therefore, mass of Cl₂ is

Therefore, 1.35g of chlorine gas will be produced.

2 Ans.

In NiCO₄, there is 1 mol of C and 4 mol of O.

So, if there are 82 mol of C, there will be 4 x 82 mol of O

Therefore, there will be 328 mol of O.

3 Ans.

Volume of AgO = 235.0 mL = 235.0 x 10^-3L

Concentration of AgO (Molarity) = 1.55 x 10^-5umol/L = 1.55 x 10^-5 x 10^-6 mol/L

Molarity is

Molar mass of AgO = 123.867g/mol

Therefore, mass of AgO is

Therefore, 4.51 x 10^-7mg of AgO is added to the flask.