A student makes a solution by measuring out 100 grams of solute and dissolving it in lots of water. The student then measures the mass of the resulting solution. He converts the mass of the solute into moles and divides that by the mass (in kg) of the solution. He reports the result as the molality of the solution. Why is the student wrong

The mass has escaped into a gas which you can not see so the law stays true.

C, small, hard spheres with insignificant volumes

The answer to the question: choose the correct statement.  a) when ethane reacts with fluorine gas the product is less stable.b) addition reactions of unsaturated hydrocarbons and halogens requires a high activation energy.  c)the double covalent bond within unsaturated hydrocarbons requires a lot of energy to break.  d)the double covalent bond within unsaturated hydrocarbons can be broken easily.is: a) when ethane reacts with fluorine gas the product is less stable.

Where is the map? i can better