Calculate the mass of 2.50 × 10^4 molecules of nitrogen gas.

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.

What is the morality of 2.50 l of solution that contains 1.85 mol of anhydrous sodium tetraborate?