DAT General Chemistry: Stoichiometry 4

Question 1

What is the mass of 3.01 × 10^23 atoms of carbon (C=12)?

Accepted Answer

6 g

Answer

12 g

Answer

24 g

Answer

3 g

Question 2

In 2Al + 3Cl2 → 2AlCl3, how many moles of AlCl3 form from 4 mol of Al with excess Cl2?

Accepted Answer

4 mol

Answer

2 mol

Answer

6 mol

Answer

8 mol

Question 3

What is the mole fraction of solute in a solution made of 2 mol solute and 8 mol solvent?

Accepted Answer

0.20

Answer

0.80

Answer

0.25

Answer

0.10

Question 4

How many grams of NaOH are needed to make 500 mL of a 2.0 M solution (NaOH=40)?

Accepted Answer

40 g

Answer

20 g

Answer

80 g

Answer

10 g

Question 5

If 10 g of CaCO3 (molar mass 100) decomposes, how many moles of CaO form (1:1 ratio)?

Accepted Answer

0.10 mol

Answer

1.0 mol

Answer

0.20 mol

Answer

10 mol

Question 6

What is the molecular formula of a compound with empirical formula CH2O and molar mass 180 g/mol?

Accepted Answer

C6H12O6

Answer

C2H4O2

Answer

C3H6O3

Answer

CH2O

Question 7

How many moles of electrons are transferred when 1 mol of Al becomes Al3+?

Accepted Answer

3 mol

Answer

1 mol

Answer

2 mol

Answer

6 mol