100.0 mL of a 0.500 M NaOH solution was mixed with 100.0 mL of a 0.500 M HCl solution in a calorimeter. Both the solutions were at the same temperature initially. If the calorimeter constant, KCal, is 55.0 J/oC, determine the heat of the reaction if the temperature goes from 11.0 oC to 38.7 oC. The specific heat of the solution is 4.18 J/g oC. Assume a density of 1.00 g/mL.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1