A cylindrical balloon of 21 cm diameter is to be filled up with H2 at NTP from a cylinder containing the gas at 20 atm and 27°C. The cylinder can hold 2.82 lit o water at NTP. Calculate the number of balloons that can be filled up state two conditions under which behavior of real gas approaches that of an ideal gas. [3+2​

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

Why is the bottom layer of a trophic pyrimid the

506g of hi produce how many grams of i2?