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Quiz 13

Quiz  13

Q Quiz 13 • Points 5 • Submitting a file upload Here's a copy of Quiz #13. To answer the questions, you can write on the .pdf with a touchscreen, you can print out the quiz on paper and write in your answers, or you can write your answers on a separate sheet of paper. Save your work as a .pdf, and submit your work using the Submit Assignment button at the top of the page. QUIZ #13 – 5 points CHEM 305 Summer 2021 Answer each question below, rounding your answers to the correct number of significant figures: 1) How many grams of Al(HCO3)3 are there in 5.02 moles of Al(HCO3)3 ? 2) How many molecules of Ni(SCN)4 are there in 17 grams of Ni(SCN)4 ? 3) How many Liters of CO2 gas are present in 0.622 moles of CO2 at STP?

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1. Mass in grams = mole * molar mass Molar mass of Al(HCO3)3 = 27 + ( 1+ 12+16*3)*3 = 210 g/mol Mole of Al(HCO3)3 = 5.02 mol Mass in grams = 5.02 * 210 = 1.05 * 103 g 2. Number of molecules = mole * Avogadro’s Number Mole = mass/ molar mass