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The heat of combustion of propane is −2,219.2 kJ/mol. Calculate the heat of formation, that ΔHf°of H2O(l) = −285.8 kJ/mol and ΔHf°of CO2(g) = −393.5 kJ/mol

Answer= -104.5KJ mol-1

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The enthalpy of combustion of hard coal averages −35 kJ/g, that of gasoline, 1.28 ×105kJ/gal. How many kilograms of hard coal provide the same amount of heat as is available from 1.0 gallon of gasoline? Assume that the density of gasoline is 0.692 g/mL (the same as the density of isooctane?

Answer= 3.7Kg

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What is the usefulness of representation of simple harmonic motion as a projection of a uniform circular motion?

What is the phase of oscillation?

Introduce phase difference using two simple pendulums?

500-mL bottle of water at room temperature and a 2-L bottle of water at the same temperature were placed in a refrigerator. After 30 minutes, the 500-mL bottle of water had cooled to the temperature of the refrigerator. An hour later, the 2-L of water had cooled to the same temperature. When asked which sample of water lost the most heat, one student replied that both bottles lost the same amount of heat because they started at the same temperature and finished at the same temperature. A second student thought that the 2-L bottle of water lost more heat because there was more water. A third student believed that the 500-mL bottle of water lost more heat because it cooled more quickly. A fourth student thought that it was not possible to tell because we do not know the initial temperature and the final temperature of the water. Indicate which of these answers is correct and describe the error in each of the other answers

Calculate the heat capacity, in joules and in calories per degree, of the following: (a) 45.8 g of nitrogen gas (b) 1.00 pound of aluminum metal

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How many days emirates cabin crew will work per month?

A student holds a thin strip of paper below his lower lip and blows air horizontally over it. If the surface area of one side of the paper is A and the mass of the strip is M the speed, V ,with which the air should be blown in order to keep the strip horizontal is (the density of air = p)

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A 0.025-g sample of a compound composed of boron and hydrogen, with a molecular mass of ~28 amu, burns spontaneously when exposed to air, producing 0.063 g of B2O3. What are the empirical and molecular formulas of the compound?

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A vessel contains oil (density = 800kgm3)

and mercury (density = 13600kgm3)

A metal sphere floats at the interface with one half of its volume immersed in mercury and the other half in oil.

The density of the metal is,

Answer = 7200kgm3

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If the density of h2o is 1gcm3 the tension of the string is.

A measuring cylinder contains 60cm3 of oil at 0degree Celsius when a piece of ice was dropped into the cylinder oil level rose to 90cm3 .when ice melted oil level came to 87cm3 mark. The relative density of ice is

Answer = 0.90

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