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Chapter 3: Composition of Substances and Solutions

Q.7E

Page 166

Write a sentence that describes how to determine the number of moles of a compound in a known mass of the compound if we know its molecular formula.

Q80 E

Page 172

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

Q.8E

Page 167

Compare 1 mole of H2, 1 mole of O2, and 1 mole of F2.

(a) Which has the largest number of molecules? Explain why.

(b) Which has the greatest mass? Explain why.

Q.9E

Page 129

Which contains the greatest mass of oxygen: 0.75 mol of ethanol (C2H5OH), 0.60 mol of formic acid (HCO2H), or 1.0 mol of water (H2O)? Explain why.

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