b0002 stoichiometry

JC Chemistry
Chapter 01
Stoichiometry
MCQ

Which of the following contains 2 mol of the stated particles ?

A. Bromine molecules in 35.5 gram of bromine gas

B. electrons in 2 grams of hydrogen gas

C. hydrogen ions in 1 dm³  of 0.1 mol dm^-3  aqueous hydrochloric acid.

D. nitrogen atoms in 22.4 dm³ of nitrogen gas at standard temperature and pressure.

Answer : B

mass	2 grams
Mr	2
mol H2  SO32-	2  2 = 1 mol
mol e-	1  2 = 2 mol

jc chem c01 u01 mcq02 question

Which statement about 1 mol of a metal

is correct?

A. It will produce 1 mol of electrons when oxidised

B. It contains the same number of atoms as  grams of C¹²

C. It has the same mass as 1 mol of C¹² atoms.

D. It has the same number of atoms as 1 mol of Helium gas.

Answer : D

1 mol of metal may produce more than 1 mol of electrons, depending on the type of metal.

1/12 grams of C¹² contains only 1/144 mol C atoms

The mass of 1 mol of metals vary depending on its relative molecular mass.