A gas has a pressure of 556 kPa at 227°C. What will its pressure be at 17°C if the volume does not change? I guess has a pressure of 556KP at 227°C. What will it’s pressure be at 17°C if the volume does not change

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !

Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction