How many moles of Cu in 7.81 * 10^21 atoms of Cu

The sun is composed mostly of hydrogen. The mass of the sun is 2.0x10^30 kg, and the mass of a hydrogen atom is 1.67x10^-27 kg. Estimate the number of atoms in the sun.

A substance is found to be made up of atoms from two elements the substance is

the abrupt change in salinity with depth is known as a? A halocline b thermocline C salolocline D pycnocline

A consequence of "yo-yo dieting is that A. cholesterol levels will increase. B. A person will develop allergies to certain foods. C. The body will actually store more fat around the waist. D. The chances of diabetes will increase?

How many moles of P are needed to react with 30.1 of O2?

Choose the statement below that is TRUE. Choose the statement below that is TRUE. A molecular compound that does not ionize in solution is considered a strong electrolyte. The term "strong electrolyte" means that the substance is extremely reactive.

How is friction harmful?

Which chemical family tends to get rid of electrons by forming a compound

A compound has a molar mass of 90. grams per mole and the empirical formula CH2O. What is the molecular formula of this compound? (1) CH2O (3) C3H6O3 (2) C2H4O2 (4) C4H8O4

It's important to match your exercise shoes with the type of exercise in which you will be participating.