How many moles of hydrogen in are 14.0 g of NH3?

4.7 mol
42 mol
0.82 mol
2.5 mol

2.5 mole

Explanation:

Molar mass of NH3 = (14 × 1) + (1 × 3) = 17g

If 3 moles of Hydrogen are in 17g of NH3

x moles of Hydrogen are in 14g of NH3

x = (14 × 3)/17

x = 2.47 mol

x ≈ 2.5 mol

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.