A sample of a gas has a pressure of 248mm Hg at 298K. What is the pressure of the gas at 398K? Select the correct answer below:

0.00539mm Hg

478mm Hg

331mm Hg

186mm Hg

Define a is a tiny pavket of energy

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

Asample of sea water contains 6.28g of sodium chloride per litre of solution. how many milligrams of sodium chloride would be contained in 15.0ml of this solution?