What is the name of CaCl2 · 2 H2O?

You have 4.275 × 1023 atoms of krypton (Kr). How many moles of krypton do you have?

Identify the molecular compound(s). CaCO3 NO2 H2O

Name the polyatomic ion, C2O42-.

What is the formula mass for C6H14N4O2?

Useful Information   Constants Avogadro’s number 6.022 × 1023 mol-1

Which of the following are among the postulates of Dalton’s atomic theory? Atoms are neither created nor destroyed during a chemical change, but are instead rearranged to yield substances that are different from those present before the change Matter is composed of exceedingly small particles called atoms Atoms are composed of protons, neutrons and electrons

What is the answer to the question below using the correct number of significant figures? 233.101 + 11.30 = ?

Find the molar mass of N2O3.

Find the average atomic mass of a sample of boron that is 71.756% boron-10 (10.07970 amu) and 28.244% boron-11 (11.08836 amu).