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Chapter 3: Q 36E (page 169)

Question: Determine the percent water in CuSO4.5H2O to three significant figures.

Short Answer

Expert verified

The percent of water in CuSO4.5H2O is 36.08%.

Step by step solution

01

Calculating moles

In CuSO4.5H2O 1 mole of the compound has 5 moles of water.

So, the mass of 5 moles of water= number of moles of water x molecular mass of water.

02

Calculating percent water

Molecular mass of CuSO4.5H2O is 249.72g/mol

Molecular mass of water = 18.02g/mol

% water = (mass of water/molecular mass of compound) x 100

= 918.02/249.72) x 100

= 36.08%

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Most popular questions from this chapter

Which of the following represents the least number of molecules?

(a) 20.0 g of H2O (18.02 g/mol)

(b) 77.0 g of CH4 (16.06 g/mol)

(c) 68.0 g of CaH2 (42.09 g/mol)

(d) 100.0 g of N2O (44.02 g/mol)

(e) 84.0 g of HF (20.01 g/mol)

Find the molarity of 40.0% by the mass aqueous solution of sulphuric acid H2SO4 for which the density is 1.3057g/ml.

A 2.00-L bottle of a solution of concentrated HCl was purchased for the general chemistry laboratory. The solution contained 868.8 g of HCl. What is the molarity of the solution?

Determine the number of moles of compound and the number of moles of each type of atom in each of the following:

(a) 25.0 g of propylene, C3H6

(b) 3.06脳10鈭�3 g of the amino acid glycine, C2H5NO2

(c) 25 lb of the herbicide Treflan, C13H16N2O4F (1 lb = 454 g)

(d) 0.125 kg of the insecticide Paris Green, Cu4(AsO3)2(CH3CO2)2

(e) 325 mg of aspirin, C6H4(CO2H) (CO2CH3)

Question: One 55-gram serving of a particular cereal supplies 270 mg of sodium, 11% of the recommended daily allowance. How many moles and atoms of sodium are in the recommended daily allowance?
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