Live Education Quiz

1

The formula mass of NaCl is:

A 23 u B 35.5 u C 58.5 u D 46 u

2

The mole ratio is taken from:

A Empirical formula B Balanced equation C Molecular formula D Atomic mass

3

One mole of O2 contains how many atoms?

A 6.02 × 10^23 B 12.04 × 10^23 C 3.01 × 10^23 D 1.00 × 10^23

4

Which law forms the basis of stoichiometry?

A Law of inertia B Law of conservation of mass C Law of motion D Law of gravitation

5

Stoichiometric coefficients are obtained from:

A Chemical equation B Chemical formula C Periodic table D Laboratory data

6

Which concept helps in converting particles to mass?

A Atomic number B Mole concept C Valency D Density

7

How many particles are present in half mole of a substance?

A 3.01 × 10^23 B 6.02 × 10^23 C 1.20 × 10^23 D 12.04 × 10^23

8

Stoichiometry is the study of:

A Atomic structure B Chemical calculations C Chemical bonding D States of matter

9

Gram molecular mass is the mass of:

A One molecule in grams B One mole of molecules C One atom in grams D One ion in grams

10

Stoichiometry helps chemists to:

A Predict reaction yield B Change atomic structure C Create new elements D Measure temperature

11

Which term is used for ionic compounds instead of molecular mass?

A Atomic mass B Formula mass C Gram mass D Relative mass

12

The mass of one mole of carbon-12 is:

A 6 g B 12 g C 24 g D 1 g

13

To convert moles into particles, we multiply by:

A Atomic mass B Molecular mass C Avogadro’s number D Density

14

The mole is a unit used to measure:

A Mass B Volume C Amount of substance D Density

15

Avogadro’s number is:

A 3.01 × 10^23 B 6.02 × 10^22 C 6.02 × 10^23 D 1.66 × 10^-24

16

Which step is necessary before stoichiometric calculations?

A Writing word equation B Balancing equation C Finding temperature D Measuring volume

17

How many moles are present in 12 g of carbon?

A 0.5 B 1 C 2 D 6

18

The term particle in stoichiometry may refer to:

A Atoms only B Molecules only C Ions only D Atoms, molecules, or ions

19

One mole of oxygen gas contains:

A 6.02 × 10^23 atoms B 6.02 × 10^23 molecules C 3.01 × 10^23 molecules D 12.04 × 10^23 atoms

20

Stoichiometric calculations are based on:

A Unbalanced equations B Balanced equations C Word equations D Skeletal equations

21

The number of atoms in one mole of aluminum is:

A 3 B 27 C 6.02 × 10^23 D 13

22

A balanced chemical equation follows the law of:

A Constant proportion B Multiple proportion C Conservation of mass D Definite composition

23

Which compound has the empirical formula CH?

A C2H2 B C2H6 C C3H8 D CH4

24

The molecular mass of CH2 is:

A 12 B 14 C 16 D 28

25

The substance left after reaction is called:

A Limiting reagent B Excess reagent C Product D Catalyst

26

The molar mass of H2O is:

A 16 g/mol B 17 g/mol C 18 g/mol D 20 g/mol

27

Which quantity remains fixed for one mole of any substance?

A Mass B Volume C Number of particles D Density

28

Which quantity links mass and number of particles?

A Density B Mole C Volume D Pressure

29

One mole of any substance contains:

A 6.02 × 10^21 particles B 6.02 × 10^22 particles C 6.02 × 10^23 particles D 6.02 × 10^24 particles

30

If empirical formula is CH2 and molecular mass is 28, molecular formula is:

A CH2 B C2H4 C C3H6 D CH4

Chem – Chapter 6: Stoichiometery