A calorimeter holds 50 g water at 21.0°C. A sample of hot iron is added to the water. The nal temperature of the water and iron is 25.0°C. What is the change in enthalpy associated with the change in the water's temperature? Note: The specific heat of water is 4.18 °C 18 FC. Show your work and circle your final answer. 22 PENCIL THIN BLACK ***

A chemist burned a sample of coal in a bomb calorimeter. Her results are below. Calorimeter's Heat Capacity 7.264 kJ/°C Mass of Coal Initial Temperature Final Temperature 0.100 g 22.07°C 25.37°C The sample of coal that the chemist placed in the bomb was dry but when she finished the test there was a small amount of water in the bomb. Where did this water come from and how does it affect her result? The water came from the water surrounding the bomb so her measured heat of combustion is for a closed system. The water was a product of combustion so her measured heat of combustion is for an open system. The water came from the water surrounding the bomb so her measured heat of combustion is for an open system. The water was a product of combustion so her measured heat of combustion is for a closed system.

A chemist heats the block of copper as shown in the interactive, then places the metal sample in a cup of oil at 25.00 °C instead of a cup of water. The temperature of the oil increases to 26.31 °C. Calculate the mass of oil in the cup. The specific heat of copper is 0.387 J/g °C and the specific heat of oil is 1.74 J/g. °C. moil = y TOOLS

895/variants/431895/take/9/ TEXT ANSWER Question 10 A calorimeter holds 50 g water at 22.0°C. A sample of hot iron is added to the water. The final temperature of the water and iron is 28.0°C. What is the change in enthalpy associated with the change in the water's temperature? Note: The specific heat of water is 4.18 g°C Use the formula AH = - cm AT Show your work. Normal A A 3x S I = = = = 外 Iロび Enter your answer here Oo00 OO of 10 Total Questions Answered All Changes Saved Continue > 11:10 AM Vordsworth, Shelle.. OEdio | Course Stude. 书 5/5/2022

CH4 (g)  + 2 O2 (g)  -->  CO2 (g) + 2H2O (g)       Δ H = -882 kJ/mol   Using the equation above, how many grams of water will form if 655 kJ of energy was released.

1) A 0.416 g sample of KCl is added to 56.5 g of water in a calorimeter. If the temperature decreases by 1.24°C, what is the approximate amount of heat (in J) involved in the dissolution of the KCl, assuming the heat capacity of the resulting solution is 4.18 J/g°C? _____  J   2) Is the reaction exothermic or endothermic?

1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as the reaction proceeds. Is this reaction endothermic or exothermic? Describe if heat energy is lost or gained from the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? 2. A student performs a reaction and determines the enthalpy change (AH) to be 31.4 kJ. Will the temperature of the surrounding solution increase or decrease as a result of this chemical process? 3. If you hold 3 grams of ice in your hand at room temperature, your hand will become cold. a) Is the reaction H,O(s) – H,O(1) endothermic or exothermic? b) In which direction does heat flow?

Can you explain where did I go wrong, I keep getting the same answer.

Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 18.0 L of water using your natural gas (primarily methane) stove. What volume of natural gas is needed to boil the water if only 10.1% of the heat generated goes towards heating the water. Assume the density of methane is 0.668 g/L, the density of water is 1.00 g/mL, and that the water has an initial temperature of 21.4 °C. Enthalpy of formation values can be found in this table. Assume that gaseous water is formed in the combustion of methane.

lp .html?ClassID=543616615# The calorimeter contains 900. g of water and the temperature change is 8.32 °C. The heat capacity of the calorimeter is 2240 J/°C. The specific heat of water is 4.18 J/g°C. 3: What is the heat of the calorimeter (water and dry combined)? 9cal = [ [? ] J Enter either a + or - sign AND the magnitude. Do not round. q.cal (J) Enter