Suppose you begin with 1.50~g of the hydrate copper (II) sulfate · x-hydrate (CuSO4· x H2O), where x is an integer. After dehydration you find that you are left with 0.96~g of the an-hydrate CuSO4. What is the unknown integer x. Round your answer to the nearest integer, enter only an integer.

Suppose you begin with of the hydrate KAl (SO4) 2 · 12H2O. After dehydration you find that you are left with 3.0~g of the an-hydrate KAl (SO4) 2. How many grams did you start with? Write the value to the correct number of significance figures.

Question

Reginald Ryan

Chemistry

7 July, 13:27

Suppose you begin with 1.50~g of the hydrate copper (II) sulfate · x-hydrate (CuSO4· x H2O), where x is an integer. After dehydration you find that you are left with 0.96~g of the an-hydrate CuSO4. What is the unknown integer x. Round your answer to the nearest integer, enter only an integer.

Suppose you begin with of the hydrate KAl (SO4) 2 · 12H2O. After dehydration you find that you are left with 3.0~g of the an-hydrate KAl (SO4) 2. How many grams did you start with? Write the value to the correct number of significance figures.

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Answers (1)

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Robert Spence · Answer 1

Given:

1.50 g of the hydrate

and 0.96 of the anhydrous substance.

Note:

1. There is one mole of CuSO4 in the hydrate compound. The ratio of the hydrate to the anhydrous is 1.

2. Molar mass of the anhydrous is (molar mass of CuSO4) + (unknown number of water) = 159.65+x (18)

1.50 = (1 / (159.65+x (18)) (1/1) (159.65/1) = 0.96 then solve for x which would result to 4. 99 or 5.

For the second problem the approach is the same, only the hydrous amount is required.