9.26 g of an unknown solid is dissolved in a coffee cup ...

[Redwolflake15]

Question 1

10.618 g of an unknown salt is dissolved in a coffee cup calorimeter that contains 50.0 mL of water. The measured temperature decreased from 23.8 °C to 22.7 °C. Identify the unknown salt. The specific heat of water is 4.184 J g-1 °C-1, and assume the density of the solution is 1.00 g mL-1.
◦ NaNO3, D_rH = 20.50 kJ mol-1
◦ NaBr, D_rH = -0.60 kJ mol-1
◦ NaF, D_rH = 0.91 kJ mol-1
◦ LiBr∙2H2O, D_rH = -23.26 kJ mol-1
◦ LiNO3, D_rH = -2.51 kJ mol-1

Question 2

9.26 g of an unknown solid is dissolved in a coffee cup calorimeter that contains 62.0 mL of water. The measured temperature increased from 23.4 °C to 24.7 °C. The specific heat of water is 4.184 J g-1 °C-1, and assume the density of the solution is 1.00 g mL-1. Calculate the molecular weight of the unknown solid if the D_rH was determined to be -2.51 kJ mol-1 via another experiment.
◦ 48 g mol-1
◦ 69 g mol-1
◦ 93 g mol-1
◦ 184 g mol-1
◦ 76 g mol-1

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