HEL!! Nitrogen and hydrogen react to produce ammonia.

N2(g) + 3H2(g)—>2NH3(g)

How many grams of hydrogen are needed to produce 15.0 mol of ammonia if the reaction goes to completion?

A. 15.0 g
B. 22.5 g
C. 90.0 8
D. 45.0 g

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest