If one half the amount of LiBr was added to 100. g of water, what would happen t
ID: 1027998 • Letter: I
Question
If one half the amount of LiBr was added to 100. g of water, what would happen to the temperature change?
The temperature change would be twice as large.The temperature change would be three times as large. The temperature change would be one-half as large.The temperature change would be one-third as large.The temperature change would be four times larger.The temperature change would be the same.
During lab, you learned about exothermic and endothermic heats of solution. Which compounds below could be used for a hot pack? (Select all that apply.)
+25.7
91.2
+26.9
81.3
+51.0
44.5
NH4NO3 (Hsolution =+25.7
kJ/mol) MgSO4 (Hsolution =91.2
kJ/mol) NaBrO3 (Hsolution =+26.9
kJ/mol) CaCl2 (Hsolution =81.3
kJ/mol) KClO4 (Hsolution =+51.0
kJ/mol) NaOH (Hsolution =44.5
kJ/mol)Explanation / Answer
If half amount of LiBr is added to the water like former then the temperature change would be one-half as large. Simply, the amount of heat involved in the former will decrease to half for this case. Enthalpy of solution is constant as we decrease it to half the amount of heat involve will be half.
The substance will be used in hot pack which have the enthalpy of solution is negetive means having exothermic heats of solution. So, MgSO4, CaCl2, NaOH can be used in hot pack.
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