What is the mass percent composition of an element in a molecule? A. The element's mass in the empirical formula divided by its molecular formula mass

B. The fraction of the molecule's mass that comes from the element's mass

C. The fraction of the element's mass that comes from one atom of the element

D. The fraction of the total number of atoms in the molecule that comes from the element

Try B. The fraction of the molecules mass that comes from one atom of the element

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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.

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(jacemorris04)