¿cuantos gramos de cloruro de calcio se requieren para preparar 80cm3 de solucion de concentracion 25%m/v? Lo necesito para hoy por favor

Calculate the number of molecules present in 0.750 mol of mgo.

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.

What would happen to a volleyball left outside in the winter? o o o o a. it would expand. b. it would lose air. c. it would shrink. d. it would explode.