A chemist weighed out

65.8

g

of potassium. Calculate the number of moles of potassium she weighed out.

Round your answer to

3

significant digits.

A 0.080L solution of Ca (OH) 2 is neutralized by 0.0293L of a 3.58 M H2CrO4 solution. What is the concentration of the Ca (OH) 2 solution?

Molar mass of acetic acid

What does conserving mas mean in a chemical equation

Proteins are large molecules. They enter a cell through A. passive transport. B. active transport. C. diffusion. D. osmosis.

CCl, 189.85 g/mol. find the molecular formula

Which is the balanced chemical equation showing hydrogen peroxide (h2o2) decomposing into hydrogen (h2) and oxygen (o2) ? 1. h2 + o2 → h2o2 2. 2 h2o2 → 2 h2 + o2 3. h2o2 → h2 + o2 4. 2 h2 + o2 → 2 h2o2?

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B.

Zircon is a mineral with the empirical formula ZrSiO4. If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10. g of zircon?

Which property below is not a general property of metals: A. Ductile C. Malleable B. Poor conductor of heat D. High luster

Calculate the number of particles (atoms or molecules) of the following: 1. How many molecules are there in 24 grams of FeF3? 2. How many molecules are there in 450 grams of Na2SO4? 3. How many grams are there in 2.3 x 1024 atoms of silver?