A substance W has a concentration of 0.02mol when its molar mass was found to be74.0gmol-1 .Another valenve V contains 1.00×10^23 atom and has molar mass of 40.g mol^-1. which of the two substance has greater mass +in grams) ? [l= 6.02×10^23]

ii) A 250Cm^3solution contains 14.65g of sodium chloride(Nacl) . calculate concentration of the solution in mol dm^3. [Na2=23 ,cl = 35.5].

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.