Answer to Question #347622 in General Chemistry for Toniece

Question

Question 14

In the above reaction in question 13, 2 moles of Mg and 5 moles of O₂ are allowed to react.

Which reagent is the limiting reagent?

a. Mg

b. O₂

c. MgO

d. There is no limiting reagent

e. Both Mg and O₂ are limiting reagents

Question 15

What is the maximum number of moles of MgO that can be formed?

a. 1 mol

b. 2 mol

c. 5 mol

d. 40.3 mol

e. 80.6 mol

Question 16

Calculate how many moles of the excess reagent remain unreacted.

a. 1 mol

b. 2 mol

c. 4 mol

d. 5 mol

e. No excess reagent remains unreacted

Question 17

Suppose that the actual moles of MgO produced was 0.5 mol, what is the percentage yield of MgO?

a. 0.62%

b. 1.2%

c. 10%

d. 25%

e. 50%

Question 18

The value of a solution concentration unit that may change with temperature is

a. molarity.

b. mole fraction.

c. molality.

d. mole percentage.

e. weight percentage.

Answer 1

1)a

2)4 mol

3)a

4)12.5%

5)b