A mixture of helium and hydrogen gases is maintained in a 8.88 L flask at a pressure of 3.58 atm and a temperature of 53 °C. If the gas mixture contains 2.03 grams of helium, the number of grams of hydrogen in the mixture is g.

Chemistry worksheet - i am not sure what they are asking for exactly?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

The same side of the moon always faces earth because the