If a sample of a substance contains 9.03 x 10^23 representative particles, how many moles does this represent?

You have a fixed container with a volume of 5.00l that contains 35.0 g nitrogen gas (n2). if the temperature is 298 k, calculate the pressure in the container. r = 0.0821 l atm / mol k

What two elements comprise most of a nebula? question 5 options: hydrogen and helium hydrogen and nitrogen oxygen and hydrogen carbon and hydrogen helium and lithium?

Element R has three isotopes. The isotopes are present in 0.0825, 0.2671, and 0.6504 relative abundance. If their masses are 98.18, 110.65, and 140 respectively, calculate the atomic mass of element R.

Which compounds are electrolytes? (1) C2H5OH and H2SO4 (2) C2H5OH and CH4 (3) KOH and H2SO4 (4) KOH and CH4

5. If you evaluated 5 solvents as possible recystallization solvents do you think it is generally true that the solvent which appears to dissolve the solute is always the best choice?

You are about to open a container of soy milk but notice that there are instructions to "shake well before serving." the soy milk is most likely a

Give reason: a. Fractionating columns with beads are used for fractional distillation b. Crystallisation is a better technique than evaporation

How can a gardener remedy soil that is overly acidic?

True or false everything has the same amount of energy?

4NH3 (g) + 502 (g) - >6H20g) + 4NOg) What is the enthalpy change for this reaction?