How much energy is released or absorbed when 40.0 g of steam at 250.0 c is converted to water at 30.0 c?

In a laboratory experiment, a student found that a 136-mL aqueous solution containing 2.257 g of a compound had an osmotic pressure of 20.7 mm Hg at 298 K. The compound was also found to be nonvolatile and a nonelectrolyte.

What is the maximum amount in moles of P2O5 that can theoretically be made from 112 g of P4 and excess oxygen?

You find a little bit (0.150g) of a chemical marked Tri-Nitro-Toluene, and upon combusting it in oxygen, collect 0.204 g of CO2 and 0.030 g H2O (we'll assume that these are the products, along with nitrogen).

The energy required to completely separate the ions from a solid is (A) free energy (B) lattice energy (C) kinetic energy (D) activation energy (E) ionization energy

A different solution with an H + concentration of 1.0 * 10-4 would have a pH =.

How many moles of solid naf would have to be added to 1.0 l of 2.39 m hf?

The sun is composed entirely of oxygen and helium True or False?

What is the oxidation number for Mn in Mn2O7? (provide sign and number)

If you have 9900 g of donuts, how many donuts do you have if each donut has a mass of 150 g?

Particles which revolve around nucleus are called