Gradebook O 2/9/2017 11:55 PM A o/2 Print Calculator Periodic Table Question 1 o

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Gradebook O 2/9/2017 11:55 PM A o/2 Print Calculator Periodic Table Question 1 of 1 Map General Chemistry 4th Edition University Science Books Rock presented by Sapling Leaming When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced Caco, (s) 2HCI (aq) CaCl, (aq)+ H Oli) coT How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate are combined with 15.0 g of hydrochloric acid? Number g Ca Cl Which reactant is in excess and how many grams of this reactant will remain after the reaction is complete? Number O CaCO3. g of O HCI G Previous Give Up & View Solution Check Answer Next Ext Hint

Explanation / Answer

CaCO3(s) + 2HCl ------- CaCl2 + H2O + CO2

Molar mass of HCl = 1 + 35.5 = 36.5

Number of moles of HCl = 15/36.5 = 0.41095 moles

Molar mass of CaCO3 = 40 + 12 + 3 * 16 = 100 gm/mol

Number of moles of CaCO3 = 27/100 = 0.27 moles

1 mole of CaCO3 gives 2 moles of HCl, hence CaCO3 is an excess reagent

Moles of CaCl2 formed = 0.41095/2 = 0.20547 moles

Mass of CaCl2 formed = 0.20547 * Molar mass of CaCl2 = 0.20547 * 111 gms = 22.808 grams

CaCO3 is excess, moles in excess = 0.27 - 0.20547 = 0.06453 moles

Mass in excess = 6.453 g of CaCO3

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