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The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Calcium Carbonate, or 100.0869 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles Calcium Carbonate and gram.
Problem #2 - calculate how many moles are in 17.0 grams of H. 17.0 grams are given in the text of the problem. The molar mass is 34.0146 grams/mole, which is calculated using the formula and the atomic weights on a periodic table. You may want to calculate this value as a double-check of your mastery of calculating molar masses. This answer has been rounded to three significant figures because of the 17.0.