The diagram shows the movement of food through the digestive organs. Which factor best explains why materials are able to move in the directions shown? *
(2 points)
1.Gravitational pull
2.Controlled movement by the muscular system called peristalsis.
3.Skeletal support

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

it's c. elements are placed in rows based on how may valencies electrons have.

the answer is na (sodium)

b. is the answer hoped i