Questions from General Chemistry

Q: Convert the following numbers of kilojoules into kilocalories. (Remember:

Convert the following numbers of kilojoules into kilocalories. (Remember: kilo means 1000.) a. 652.1 kJ b. 1.00 kJ c. 4.184 kJ d. 4.351 * 103 kJ

Q: The chemical formula for aspirin is C9H8O4. What is the mass

The chemical formula for aspirin is C9H8O4. What is the mass percent for each element in 1 mole of aspirin? (Give your answer to four significant figures.)

Q: Arrange the following substances in order of increasing mass percent of nitrogen

Arrange the following substances in order of increasing mass percent of nitrogen. a. NO b. N2O c. NH3 d. SNH

Q: Perform the indicated conversions. a. 625.2 cal

Perform the indicated conversions. a. 625.2 cal into kilojoules b. 82.41 kJ into joules c. 52.61 kcal into joules d. 124.2 kJ into kilocalories

Q: What is the kinetic energy of a particle of mass m moving

What is the kinetic energy of a particle of mass m moving through space with velocity ν?

Q: Perform the indicated conversions. a. 91.74 kcal

Perform the indicated conversions. a. 91.74 kcal into calories b. 1.781 kJ into calories c. 4.318 * 103 J into kilocalories d. 9.173 * 104 cal into kilojoules

Q: If 69.5 kJ of heat is applied to a 1012

If 69.5 kJ of heat is applied to a 1012-g block of metal, the temperature of the metal increases by 11.4 8(C. Calculate the specific heat capacity of the metal in J/g 8(C.

Q: What quantity of heat energy must have been applied to a block

What quantity of heat energy must have been applied to a block of aluminum weighing 42.7 g if the temperature of the block of aluminum increased by 15.2 °C? (See Table 10.1.) Table 10.1

Q: If 125 J of heat energy is applied to a block of

If 125 J of heat energy is applied to a block of silver weighing 29.3 g, by how many degrees will the temperature of the silver increase? (See Table 10.1.)

Q: If 100. J of heat energy is applied to a 25

If 100. J of heat energy is applied to a 25-g sample of mercury, by how many degrees will the temperature of the sample of mercury increase? (See Table 10.1.)