It’s c I believe because it says 209 years to complete an orbit so hint yourself ?.....
Answer: The volume occupied by 2.50 moles of
gas at STP is 56.0L
Explanation:
According to ideal gas equation:

P = pressure of gas = 1 atm (at STP)
V = Volume of gas = ?
n = number of moles = 2.50
R = gas constant =
T =temperature =
(at STP)


Thus the volume occupied by 2.50 moles of
gas at STP is 56.0L
Answer:
669 Liters
Explanation:
From the equation, it takes 3/2 as much hydrogen as ammonia gas
3/2 * 446 = 669 Liters of H2 gas