1. How many cobalt atoms are in 345 g of cobalt? 2. Calculate the molar mass of carbon tetrachloride, CCl4.

3. What's the mass of 4.23 moles of sodium chloride, NaCl?

4. Titanium has become the preferred metal for high-end bicycles because they're significantly lighter than bicycles made with iron. Explain why one mole of titanium weighs less than one mole of iron.

5. Road salt is used in northern climates by the metric ton. How many moles of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day? 1 metric ton = 1000 kilograms

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize