Question

8 Use the information and examples provided in the Exploration to calculate how many moles of CaCh+2H20 are present in 150 g of CaCly 2H20 and then calculate how many moles of pure Cach are present in the 1.50 g of CaCl 2H2O. Record the answers in Data Table 1 Use the information and examples provided in the Exploration (and values input into Data Table 1, in step 8) to determine how many moles of Nazco, are necessary to reach stoichiometric quantities. From that calculation, determine how many grams of Na2CO, are necessary to reach stoichiometric quantities. Record both values in Data Table 1

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Answer 1

Amount of Call2.2H2O given = 1.50g Molecular weight of Calez. 2H2O = 147 g/mole. No. of moles - given weight of compound gts molecular weight No. of moles of Call. 2H₂O = 1.50g R 147g/mole =0.0102 moles. Call. 2H₂O - a Call2 call + 2H2O + 2 - mole call. 2H₂O contain Imole Call .. - $ 2 moles of water. So, from balanced equation alove - Imole Calb. 2H₂O = Imole Call(s). 10.0102 mol Cach. 2H2O Z 0.0102 mol Calea So No. of moles of pure substance (Cacero 0.1020 moles. Aleove g. Salertion is reacted with Na₂COg solution. - Reaction: - Call +. Na₂CO3 - CaCO3 +2Nace This reaction is called double displacement reaction.

from balmced equation : I mole of Calle reacts with I mole of Nazcoz to form Imole of CaCO3 $ 2 moles of Nace. So.. I male Calle E Imole Na2CO3. 0.0102 mol Calle = 0.0102 moles Na2Coz. I No. of moles of Na coz required = 0.0002 moles. Amount of Na, Colz in groms required No. of molcs x molecular weight: molecular weight of Nazcoz = 100g/mole 0.0102 * 106.9 x mole => 1,0812.9 mole | Nag CO3 required = 1.0812 g)

from balanced equation, - Imole Calls with Imole Nazcoz producing - Imole of CaCO3. . So I mole Cally = 1 mole CaCO3 0.002 mol Cach I 0.0102 mol CaCO3. So 0.0102 moles of CaCO3 must be formed Amount of. Ca coz in grams > O moles & molecular weight. molecular weight of CaCO3 → looglmale Amount of CaCOz (theoretical & 0.0102x100=> 1.02 groms, let experimental yield = x ( not given by % yild & Experimental ridd xloo ... Theoretical yidd of yield= x xloo 1.02 Plz don't dislike - you)