How many O atoms are there in 0.35 mol of Ca(NO3)2? ¿Cuántos átomos de O hay en 0,35 mol de Ca(NO3)2?

The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?

Asolution is made by dissolving 2.3 moles of sodium chloride (nacl) in 0.155 kilograms of water. if the molal boiling point constant for water (kb) is 0.51 °c/m, what would be the boiling point of this solution? show all the steps taken to solve this problem.

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes or no?