What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours?

(1) 2.5 mg

(2) 5.0 mg

(3) 10 mg

4) 20 mg

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

Why is it important for scientists to replicate each other's experiments?

Mountain ranges are formed by: plate collision melting of rock in the mantle evaporation of ocean waters buildup of salt and sediment

An analysis of 10.0 grams of sample of a compound is found to contain 27.0 percent sodium (na), 16.5 percent nitrogen (n), and 56.5 percent oxygen (o). determine the empirical formula of the compound.

a bond where electrons are transferred from one atom to another, resulting in charge imbalance in each atom. a bond where electrons are equally shared, resulting in equal numbers of electrons orbiting each atom.

This type of formula indicates the kind, number, arrangement, and bonds but not the unshared pairs of the atoms in a molecule.

What does the water inside the jar represent

What is solubility? 1) solubility is how much solute will precipitate out of solvent 2) solubility is how much solvent will dissolve in solute 3) solubility is how much solid only will dissolve in liquid only

Is burning of coal a reversible change? If yes how?

How many grams of tin are found in 3.5 moles of tin