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In the above reaction, 1.25 g of Ca(s) reacts with excess Cl2(g), forming CaCl2(s). The heat...

In the above reaction, 1.25 g of Ca(s) reacts with excess Cl2(g), forming CaCl2(s). The heat released by the reaction warms up 150. g of water from 20.0 o C to 59.5 o C. Calculate ΔHrxn. I already calculated for the water but my problem is I don't know what to do for the reaction. I know the answer is -794kj but when I look at the worked out solution for the problem it doesn't tell e anything about what to do with the 1.25g of Ca

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