A sample of hydrogen gas has a volume of 8.56 L at a temperature of 0°C and a pressure 1.5 atm. Calcite the moles of H2 molecules present in the sample.

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i