926 G of an Unknown Solid Is Dissolved in a Coffee

question 14

Multiple Choice

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 Δ_rH was determined to be -2.51 kJ mol^-1 via another experiment.

• A)69 g mol^-1
• B)48 g mol^-1
• C)76 g mol^-1
• D)184 g mol^-1
• E)93 g mol^-1

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