How many molecules are in 0.943 grams of water

3.16 x 10²² molecules H₂O in 0.943 gram

Explanation:

Given 0.943 g H₂O = (0.943 g / 18 g·mol⁻¹) = 0.05253 mol H₂O

0.05253 mol H₂O = 0.05253 mol H₂O x 6.023 x 10²³ molecules·mol⁻¹

= 3.16 x 10²³ molecules H₂O

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.