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10618 G of an Unknown Salt Is Dissolved in a Coffee

Question 45

Multiple Choice

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.


A) NaF, 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<sup>-1</sup> °C<sup>-1</sup>, and assume the density of the solution is 1.00 g mL<sup>-1</sup>. A) NaF, H = 0.91 kJ mol<sup>-1</sup> B) NaBr, H = -0.60 kJ mol<sup>-1</sup> C) NaNO<sub>3</sub>, H = 20.50 kJ mol<sup>-1</sup> D) LiNO<sub>3</sub>, H = -2.51 kJ mol<sup>-1</sup> E) LiBr∙2H<sub>2</sub>O, H = -23.26 kJ mol<sup>-1</sup> H = 0.91 kJ mol-1
B) NaBr, 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<sup>-1</sup> °C<sup>-1</sup>, and assume the density of the solution is 1.00 g mL<sup>-1</sup>. A) NaF, H = 0.91 kJ mol<sup>-1</sup> B) NaBr, H = -0.60 kJ mol<sup>-1</sup> C) NaNO<sub>3</sub>, H = 20.50 kJ mol<sup>-1</sup> D) LiNO<sub>3</sub>, H = -2.51 kJ mol<sup>-1</sup> E) LiBr∙2H<sub>2</sub>O, H = -23.26 kJ mol<sup>-1</sup> H = -0.60 kJ mol-1
C) NaNO3, 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<sup>-1</sup> °C<sup>-1</sup>, and assume the density of the solution is 1.00 g mL<sup>-1</sup>. A) NaF, H = 0.91 kJ mol<sup>-1</sup> B) NaBr, H = -0.60 kJ mol<sup>-1</sup> C) NaNO<sub>3</sub>, H = 20.50 kJ mol<sup>-1</sup> D) LiNO<sub>3</sub>, H = -2.51 kJ mol<sup>-1</sup> E) LiBr∙2H<sub>2</sub>O, H = -23.26 kJ mol<sup>-1</sup> H = 20.50 kJ mol-1
D) LiNO3, 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<sup>-1</sup> °C<sup>-1</sup>, and assume the density of the solution is 1.00 g mL<sup>-1</sup>. A) NaF, H = 0.91 kJ mol<sup>-1</sup> B) NaBr, H = -0.60 kJ mol<sup>-1</sup> C) NaNO<sub>3</sub>, H = 20.50 kJ mol<sup>-1</sup> D) LiNO<sub>3</sub>, H = -2.51 kJ mol<sup>-1</sup> E) LiBr∙2H<sub>2</sub>O, H = -23.26 kJ mol<sup>-1</sup> H = -2.51 kJ mol-1
E) LiBr∙2H2O, 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<sup>-1</sup> °C<sup>-1</sup>, and assume the density of the solution is 1.00 g mL<sup>-1</sup>. A) NaF, H = 0.91 kJ mol<sup>-1</sup> B) NaBr, H = -0.60 kJ mol<sup>-1</sup> C) NaNO<sub>3</sub>, H = 20.50 kJ mol<sup>-1</sup> D) LiNO<sub>3</sub>, H = -2.51 kJ mol<sup>-1</sup> E) LiBr∙2H<sub>2</sub>O, H = -23.26 kJ mol<sup>-1</sup> H = -23.26 kJ mol-1

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