Glycerol (molar mass 92.09 g/mol) has been suggested for use as an alternative fuel. The enthalpy of combustion, AH comb, of glycerol is -1654 kJ/mol. What mass of glycerol would need to be combusted to heat 655.0 g of water from 25.0°C to 50°C? (The specific heat capacity of water is 4.184J/(g*c). Assume that all the heat released by the combustion reaction is absorbed by the water.)

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

In a covalent bond, two atoms are held together by the attraction between . the number of covalent bonds that an atom can form depends on the number of in the atom.

The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.