1. How many moles of Zn are there in 6.52 x 10^21 atoms of Zn? 2. How many grams of Na are in 54.50 mg of sodium carbonate (Na2CO3)?
3. How many atoms of Ca are there in 27.34 μg of CaCl2?
4. Anniah asks Richard, the winemaker at Lipote Winehouse, about the status of the new batch of Lipote
wine. Richard reports that it is 2.35 M of ethanol (CH3CH2OH) content. What is the concentration of
ethanol in % w/v?
5. The Pasig river was reported to have a Hg content of 157 ppm. What is the concentration in molarity?
6. Describe how you would prepare a 125.0 mL of 25.5 % w/v KCl solution from a stock solution of 75.0
% w/v KCl solution.
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