A coffee cup calorimeter initially contains 130g water at 22.7 Celsius. 12.4g of a Calcium Chloride, also at 22.7 Celsius, is added to the water and, after the CaCl2 dissolves, the final temperature is 38.0 Celsius. Calculate the enthalpy change for the dissolving of the salt in kJ/mol.

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots

Geothermal energy for industrial use is available almost anywhere. a. true b. false

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3