Is it C?

Which of the following materials contains components in a fixed ratio?

A.

element

B.

compound

C.

mixture

D.

solution

What is the mole fraction of h2s in the gas mixture of gases made up of 7.0 g of H2S, 10.0 g of CH4 and 12.0 g of O2

1. A sample of gold (Au) has a mass of 35.12 g. a. Calculate the number of moles of gold (Au) in the sample and record in Table 1. Show your work. b. Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work. 2.

The atomic mass of 13C is 13.003355. Multiply the atomic mass of 13C by its abundance. Report the number to 8 significant digits.

If a substance could reach absolute zero, which of these would be equal to zero? A.) heat B.) temperature C.) particle motion D.) all of these

All elements have a ΔHf of 27314.1840 kJ/mole at standard temperature and pressure.

How do ionization energies provide evidence for the quantization of the energies of electrons?

What causes lightning? a) thunder b) an electric discharge c) rising warm air d) air masses meeting

In a problem, you are given two pressures and one temperature at constant volume and amount of gas. You are asked to find a second temperature. What law should you use?

How many cups are in a 5-lb. bag of flour?

How is oxygen separated from other substances nearby?