PLEASE HELP what is the mole fraction of MgCl2 in a solution created by dissolving 132.1 g of MgCl2 into 9.72 mol of water?

1 - 0.125
2- 12.5
3- 2.50
4- 0.225

What type of reaction is illustrated? 2c12o5 = 2cl2 + 502

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.