Hydrates Percent Composition

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent composition by mass of sulfur in the compound MgSO₄ ?

• 20%

• 27%

• 46%

• 53%

What is the percent composition by mass of oxygen in the compound MgSO₄ ?

• 20%

• 27%

• 46%

• 53%

Name the following ionic compound: MgSO₄*7H₂O

• magnesium sulfate * hexahydarte
• magnesium sulfate hexahydarte
• magnesium sulfate heptahydrate
• magnesium sulfate* heptahydrate

A compound is a hydrate when it...

• is composed of only hydrogen and oxygen

• is a state of water

• is an ionic compound with water losely attached

• repels water from the compound

In the performance of the copper II sulfate hydrate lab a visual indicator that water was still present was

• the substance was blue

• the substance turned white

• the substance fizzed

• the substance changed temperature

What is the percent composition of MgSO₄ in the following ionic compound: MgSO₄*7H₂O

What is the percent composition of water in the hydrate: NaCl * 5H₂O

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is percent composition of water?