What is the energy of a photon with a frequency of 1.7 × 1017 hz? planck’s constant is 6.63 × 10–34 j•s.
a} 1.1 × 10–17 j
b} 1.1 × 10–16 j
c}8.3 × 10–16 j
d} 8.3 × 10–15 j

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Are oil and water a mixture or solution

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.