Practice - Enthalpy of solution

Organize the following characteristics as either endothermic or exothermic

Groups:

(a) Endothermic

,

(b) Exothermic

• Sign of q for water is positive

• Energy of water increases

• Temp of water increases

• Energy of solute increases

• Temp of water decreases

• sign of q for solute is positive

• Energy of solute decreases

• Sign of q for water is negative

• Energy of water decreases

• Sign of q for solute is negative

• T_f = 29.5 ⁰C

• T_f = 32.7 ⁰C

• T_f = 26.4 ⁰C

• T_f = 36.8 ⁰C

Answer explanation

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

If 1 mol of each solute is dissolved in 500 mL of water, rank the resulting solutions from warmest (1) to coldest (4)

• LiNO₃

• NaC₂H₃O₂

• KMnO₄

• KOH

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In a chemistry experiment to investigate the properties of fertilizer, 10.0 g of urea, NH₂CONH₂ (s), is dissolved in 150.0 mL of water. A temperature change from 20.4 ⁰C to 16.7 ⁰C is measured. Calculate the molar enthalpy of solution for the fertilizer urea.

• ΔH_soln = +17.7 kJ/mol

• ΔH_soln = -13.9 kJ/mol

• ΔH_soln = +14.9 kJ/mol

• ΔH_soln = +10.5 kJ/mol

Answer explanation

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The molar enthalpy of solution of ammonium chloride is +14.8 kJ/mol. What would be the final temperature of a solution in which 40.0 g of ammonium chloride is added to 200.0 mL of water, initially at 25 ⁰C?

• 12.7 ⁰C

• 10.5 ⁰C

• 11.4 ⁰C

• 13.9 ⁰C

Answer explanation

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1