Which of the following happens during a lunar eclipse?
a: earth casts a shadow on the moon.
b: the moon casts a shadow on earth.
c: earth stops revolving in its orbit.
d: earth starts revolving around the moon.

The answer is A: Earth casts a shadow on the moon.

Explanation:

A lunar eclipse occurs when the earth passes between the sun and the moon, and the three of them are aligned. As the light of the moon that we see from the earth is actually the reflection of the sun's rays on it, when the earth is between the moon and the sun, it doesn't let the sun's rays to reach the moon, so what we see is the shadow of the earth over the moon.

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