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

Does "it has been raining where you live for the past hour" fit into the definition of weather why or why not

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 57.1 grams of sodium are added to water?

What is transition metals oxidation state?

What would you observe in a solution of 30 g of KC1O3 in 100 g of water at 10 c? a. about 5 g of the KC1O3 is dissolved b. about 20 g of the KC1O3 is dissolved c. all of the KC1O3 is dissolved d. none of the KC1O3 is dissolved

What is an Environmental Protection Act generally speaking?

A chemistry student needs 90.0g of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is 1.26·gcm-3. calculate the volume of glycerol the student should pour out.

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.

Darwin visited the Galapagos Islands several times. He observed some very unusual species. One species of bird, the finch, interested him. He observed some differences in the finches living on different islands.

Why does land heat up more faster than water?

Which gas law has assumptions of a fixed amount and temperature of a gas