[dp7]

A typical hot pack is designed to reach a temperature of 50.°C from room temperature, 20.°C. Assuming that the hot pack will contain 100. mL of water, the mass of CaCl2 (FW = 111 g/mol) that would be needed to bring about this temperature change (ΔHsoln = -­‐82 kJ/mol) is:

[sjb]

A typical hot pack is designed to reach a temperature of 50.°C from room temperature, 20.°C. Assuming that the hot pack will contain 100. mL of water, the mass of CaCl2 (FW = 111 g/mol) that would be needed to bring about this temperature change (ΔHsoln = -­‐82 kJ/mol) is:

Any formulas you know that may help?

[Dan]

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