Question

question 18 & 19

18) For a certain hot system in contact with cool surroundings, the half-life time for loss of excess thermal energy to the surroundings is 10 minutes. This means what about the excess thermal energy? It is a) all gone in 20 minutes b) half gone in 5 minutes c ) half gone in 20 minutes d) all gone in 10 minutes e) none of the above 19 You have 400 ml of a saturated solution of a certain solute: Its concentration is 8.00 M. If you plan to add water and make the final volume 500. mL, how many more moles of the solute should be added in order to keep it a saturated solution? (You add the solute, then make the volume to 500 mL.) a) 3.2 b) 0.80 c) 4.0 d) 2.4 c) 1.6

Answer 1

wi veu thaf for Cofe hors fale Inhal Voluu 0y neuhaBon dak 8X O 32 an Ofter adoly or aval e faf v)veleare suom same Jatrakec M, Vr 3.2mal Males Palek fhoulo lo aololo ou.o8-9