A pure gold ring and pure silver ring have a total mass of 16.9 g . The two rings are heated to 72.2 ∘C and dropped into a 13.5 mL of water at 21.8 ∘C. When equilibrium is reached, the temperature of the water is 24.4 ∘C.What is the mass of gold ring? (Assume a density of 0.998 g/mL for water.)What is the mass of silver ring? (Assume a density of 0.998 g/mL for water.)

To calibrate a calorimeter, 10.0 ml of 1.0 M NaOH and 5.0 ml of 1.0 M HCl was used in a calorimetry experiment. Which of the following will have NO EFFECT on the calculated heat capacity of the calorimeter, Ccal? a. Accidentally adding HNO3 instead of HCl. b.Adding a smaller volume of 1.0 M HCl. c.Using a bigger styrofoam ball for calibration. d.Using a wet test tube for calibration.

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHcomb for dimethylphthalate (C10H10O4) is –4685 kJ/mol. Assume 0.910  g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.40  kJ/°C at 22.0 °C. What is the final temperature of the calorimeter?     °C

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHcomb for dimethylphthalate (C10H10O4) is –4685 kJ/mol. Assume 1.16  g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.85  kJ/°C at 20.0 °C. What is the final temperature of the calorimeter?

None

ty

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHcomb for dimethylphthalate (C10H10O4) is –4685 kJ/mol. Assume 1.01  g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 6.95  kJ/°C at 20.5 °C. What is the final temperature of the calorimeter?

a) Two substances, lead and granite, initially at different temperatures, come into contact and reach thermal equilibrium. The mass of lead is 20.4 gg and its initial temperature is 55.7 ∘C∘C. The mass of granite is 18.7 gg and its initial temperature is 22.7 ∘C∘C. What is the final temperature of both substances at thermal equilibrium? (The specific heat capacity of lead is 0.128 J/(g⋅∘C)J/(g⋅∘C); the specific heat capacity of granite is 0.79 J/(g⋅∘C)J/(g⋅∘C).) b) A 4.03 gg sample of gold, initially at 70.4 ∘C∘C, is submerged into 60.8 gg of water at 17.8 ∘C∘C in an insulated container. What is the final temperature of both substances at thermal equilibrium? (The specific heat capacity of gold is 0.128 J/(g⋅∘C)J/(g⋅∘C);the specific heat capacity of water is 4.18 J/(g⋅∘C)J/(g⋅∘C).)

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of triangle H COmb for dimethylphthalate (C 10 H 10 O 4 )is-4685 kJ/mol . Assume 0.940 g of dimethylphthalate combusted in a calorimeter whose heat capacity (C Calorime ) is 7.40 kJ/^ C at 20.0 degrees * C . What is the final temperature of the calorimeter?

A soft drink (290 mL of mostly water) initially at 18.0 C is cooled by adding 197 g of ice cubes at 0 C. What mass of ice remains when the temperature of the drink reaches equilibrium (water and ice at 0 C)? The enthalpy of fusion of water (i.e., the heat required to melt ice) is 6.007 kJ/mol. The density of the water is 1.0 g/mL. Assume the specific heat capacity of water is constant and equal to 4.184 J/g/C.