Formulas of Hydrates

Name the following ionic compound: MgSO₄·7H₂O

• magnesium sulfate * hexahydarte

• magnesium sulfate hexahydarte

• magnesium sulfate heptahydrate

• magnesium sulfate* heptahydrate

Na₂CO₃ · 10H₂O is known as sodium sulfate ______

• Hydroxide
• Hydrate
• Decahydrate
• None of the above

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 the formula of the hydrate?

• MgCO₃ · 5H₂O
• MgCO₃ · 4H₂O
• MgCO₃ · 6H₂O
• MgCO₃ · 1H₂O

Tags

NGSS.HS-PS1-7

A hydrate of magnesium chloride is present and the following data is collected:
mass of crucible = 22.130 grams
mass of crucible + hydrate = 25.290 grams
mass of crucible and contents after heating = 23.491 grams
What is the complete formula of this hydrate?

• MgCl₂ · 7H₂O
• MgCl₂ · 11H₂O
• MgCl₂ · 6H₂O
• MgCl₂ · 13H₂O

Tags

NGSS.HS-PS1-7

What is the empirical formula for the following:
32.40% sodium, 22.5% sulfur; 45.1 % oxygen, 37.75% water?

• Na₂SO₄H₆O₃
• Na₂SO_{4 .} 2H₂O
• Na₂SO_{4 .} 3H₂O
• Na₂SO_{4 .} (H₂O)₃

Tags

NGSS.HS-PS1-7

A compound is a hydrate when it...

• is composed of only hydrogen and oxygen
• is a state of water
• traps water inside of the compound
• repels water from the compound

Cr(NO₃)₃ ⋅ 9H₂O

• chromium nitrate nonahydrate
• chromium nitrogen trioxide nonahydrate
• chromium (III) nitrate nonahydrate
• chromium (I) tritrioxide heptahydrate

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

Crucible, cover: 17.8 g
Crucible, cover, and hydrate: 23.9g
Crucible, cover, and salt: 21.5g
Calculate % of water lost.

• 90.0%
• 60.7%
• 39.3%
• 45.5%

Tags

NGSS.HS-PS1-7

What is the correct chemical formula for barium hydroxide octahydrate?

• Ba(OH)₂ . 8H₂O

• Ba(OH)₂ . H₂O

• 8Ba(OH)₂ . H₂O

• Ba . 8(OH)₂