The different substance in a mixture

If I use 0.0395 kg of water to dissolve 0.0189 kg of salt, what is the mass percent of this solution?

If volume is increased, the number of collisions per second ... decreases or increases?

How does the position of an element on the periodic table allow you to determine if the element is a metal

18. What element has 81 protons in the nuclei of its atoms?

15.00 g of NH4HS (s) is introduced into a 500. mL flask at 25 °C, the flask is sealed, and the system is allowed to reach equilibrium. What is the partial pressure of ammonia in this flask if Kp = 0.108 at 25 °C for: NH4HS (s) ⇄ NH3 (g) + H2S (g) ?

What are the 4 variables that influence gas behavior

A 15.0 L tank of gas is contained at a high pressure of 8.20 x 10^4 torr. The tank is opened and the gas expands into an empty chamber with a volume of 6.00 x 10^4 L. Calculate the new pressure of the gas.

What amount of sucrose (C12H22O11) should be added to 5.83 mol water to lower the vapor pressure of water at 50 °C to 72.0 torr? The vapor pressure of pure water at 50 °C is 92.6 torr. 1

What element is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p4?

What is the similarity between simple diffusion and facilitated diffusion?