Question

Would you expect the amount of heat released/absorbed for the dissolution of 4 g of NH4NO3(s)...

Would you expect the amount of heat released/absorbed for the dissolution of 4 g of NH4NO3(s) in 50.0 g of water to be greater than, less than, or equal to, the amount of heat released/absorbed for the dissolution of 2 g of NH4NO3(s) in 50.0 g of water? Explain your reasoning.

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Answer #1

As amount of heat released or absorbed (Q)during a physical change depends upon 3 factors

1. The specific heat capacity of the substrate

2. the moles of the substance reacting and

3. the change in temperature

So Q is proportional to no. of moles

for 4 gm of ammonium nitrate no. of moles is higher than 2 gm of ammonium nitrate.

So, heat absorbed/released for the dissolution of 4 gm of ammonium nitrate in 50 gm of water is greater than heat  absorbed/released for the dissolution of 2 gm of ammonium nitrate in 50 gm of water

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