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Solved worksheet with practice problems using Avogadro’s number and molar masses
Typology: Exercises
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In these problems the compound (or chemical formula) becomes part of the unit: (e.g. 32.54g NaCl )
a) Calculate the mass of 5.634 moles of HCN. b) Calculate the moles of 257.354g of K 2 CrO 4 c) Calculate the mass of 0.467 moles of CaBr 2 d) Calculate the moles of 12.354 grams of C 6 H 12 O 6 e) Calculate the mass of 8.26 mmoles of KClO 4 f) Calculate the moles of 35.7 milligrams of Sr(NO 3 ) (^2)
a) 2.57 x 10 11 atoms of silver equals how many moles of silver? [What is the chemical symbol of silver?] b) 2.845 x 10 12 potassium ions [What is the chemical symbol of the potassium ion?] equals how many moles of potassium ions? c) 0.0524 moles of H 2 O equals how many molecules of water? d) 347865 atoms of xenon are equal to how many moles of Xe? e) 3.25 x 10 25 atoms of neon gas equals how many moles of neon gas? f) How many moles of H 2 SO 4 do you have if you there are 1.64 x 10^12 molecules of H 2 SO 4?
Answers.
All answers to #2, #3 and #4 should have the chemical formula as part of the unit.