consider the reaction 2A + 3B ---> 3C +2D. the standard enthalpy of formation for A, B,C and D are -79.8, 49.2, -145.8, and -87.4, in kJ/mol. What is the standard enthalpy change for the reaction in kJ / mol?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?