How many atoms or molecules are there in a mole of a substance?

Which of the following cannot be separated by physical means? A. mixtures B. solutions C. elements D. none of the above

Which of the following is true for a gas under conditions of very low temperature? PV : nRT = 1, because all gases behave ideally at very low temperatures. PV : nRT = 1, because the actual volume of the gas molecules becomes considerable.

Mario noticed that 1 out of every 6 cars on a car lot was white. If the dealer had 434 white cars, what was the total number of cars on the lot?

Find the mass in grams of 2.00*1023 molecules of C10H140

In two or more complete sentences describe how atomic radius changes as you move down a group in the periodic table and why.

What factors can make atoms unstable

Nitrogen (N), oxygen (O), chlorine (Cl), neon (Ne), and argon (Ar) are all elements that occur as a gas at room temperature (20°C). Using the periodic table, which pair of gases has the most similar properties?

what will be the new volume of a 250mL sample of gas at 300 k and 1 atm if heated to 350 k at 1 atm law use:

Which statement describes the chemical property of oxygen

The reaction CH3NC? CH3CN is called an isomerization reaction andinvolves the breaking of a C-N bond and subsequent formation of a C-C bond-the reactant andproduct have the same molecular formulas and so are isomers.