11. A sample contains 25% water and weighs 201 grams. Determine the grams of water in the sample.

Explanation:

Hello,

In this case, considering that the by-mass percent of water is:

Given such percent and the mass of the sample, we can find the mass of water in grams in the sample by solving for it as shown below:

Best regards.

3 hours because it is a decent distance.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.