A mixture of krypton and helium gases at a total pressure of 980 mm Hg contains krypton at a partial pressure of 366 mm
Hg. If the gas mixture contains 10.2 grams of krypton, how many grams of helium are present?

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6