A container of 5 L water is left out on a hot day. A temperature change of 2.5°C was noted. Estimate the heat transfer that took place. (Ignore all other heat loss)
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- A coffee cup calorimeter contains 48.00 grams of water at 25.0°C. Two additional samples of water are added to the calorimeter as follows: 38.00 grams of water at 53.5°C 52.50 grams of water at 65.5°C Assuming there is no heat absorbed by the calorimeter or lost to the surroundings, calculate the final temperature of the water in °C. The specific heat of water is 4.184 J g‑1°C-1.1. (a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.2 -g peanut if the energy from burning it is transferred to 0.5 kg of water held in a 0.12 -kg aluminum cup, causing a 54.3 °C temperature increase? The specific heat of water is 1.00 kcal/kg °C, and the specific heat of aluminum cup is 0.215 kcal/kg °C ✓kcal/g mp (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent. A label for unsalted dry roasted peanuts says that 30 g contains 175 calories (kcal). Find the (Q/m) from calorimetry techniques of the label on a box of roasted peanuts. m cal m labelA 0.217 kg sample of tin initially at 96.9◦Cis dropped into 0.112 kg of water initially at10.2◦C.If the specific heat capacity of tin is230 J/kg ·◦C, what is the final equilibriumtemperature of the tin-water mixture? Thespecific heat of water is 4186 J/kg ·◦C.Answer in units of ◦C.
- To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 16.8 g, and its initial temperature is -10.7 °C. The water resulting from the melted ice reaches the temperature of his skin, 29.4 'C. How much heat is absorbed by the ice cube and resulting water? Assume that all of the water remains in the hand. Constants for water can be found in this table.The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9°C temperature increase?A dog loses a lot of heat by panting. The air rushing over the upper respiratory tract causes evaporation and thus heat loss. A dog typically pants pants at a rate of around 304 pants per minute. As a rough calculation, assume that one pant causes 0.0400 g of water to be evaporated from the respiratory tract. What is the rate of heat loss for the dog by panting? The heat of vaporization for water is 2256 kJ/kg.