Formula of Hydrates

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 · H₂O

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What is the chemical formula for iron(III) chloride hexahydrate?

• FeCl3·6H2O

• FeCl3·3H2O

• Fe2Cl6·6H2O

• Fe3Cl6·H12O3

Tags

NGSS.MS-PS1-1

What is the correct name for the compound, CaSO4•2H2O?

• carbon sulfate dihydrate

• calcium sulfur oxide dihydrate

• calcium sulfide dihydrate

• calcium sulfate dihydrate

• calcium sulfite dihydrate

Tags

NGSS.MS-PS1-1

A 20.0 g sample of a hydrate of copper(II) sulfate was heated to drive off the water. The mass was reduced to 12.8 g. What is the formula of the hydrate?

• CuSO_4 · 5H_2O

• CuSO_4 · 3H_2O

• CuSO_4 · 7H_2O

• CuSO_4 · H_2O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What is the chemical formula for cobalt(II) chloride hexahydrate?

• CoCl_2 · 6H_2O

• CoCl_2 · 3H_2O

• Co_2Cl_3 · 6H_2O

• CoCl_3 · 6H_2O

Calculate the percent by mass of water in the hydrate Na_2SO_4 · 10H_2O. Be sure to round all masses from the Periodic Table to the nearest tenth and round the percent water to the correct number of significant figures. Include the correct unit with your numerical answer.

• 55.9%

• 62.9%

• 45.5%

• 51.2%

What is the correct name for the compound, Ba(OH)_2 · 8H_2O?

• barium hydroxide octahydrate

• barium oxide octahydrate

• barium hydroxide dihydrate

• barium dihydroxide octahydrate

A hydrate of barium chloride has a mass of 24.0 g before heating and 20.8 g after heating. What is the formula of the hydrate?

• BaCl_2 · 2H_2O

• BaCl_2 · 4H_2O

• BaCl_2 · 6H_2O

• BaCl_2 · H_2O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5