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eaglesjohnson414
05.03.2021 •
Physics
Mary's rat is running along the top of a ledge, 3.2m tall. The rat unknowingly runs off the ledge and lands 5.7m away. How long is the rat in the air?
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Ответ:
a) 132 g NaCl consumed at 1.5 Atm & 290K
b) 93.2 g NaCl consumed at STP
Explanation:
F₂ + 2NaCl => 2NaF + Cl₂
Given 18L F₂(g) at 1.5Atm & 290K
moles F₂(g) = PV/RT = (1.5Atm)(18L)/(0.08206L·Atm/mol·K)(290K) = 1.135 mol F₂(g) consumed
moles NaCl consumed = 2(moles F₂) = 2(1.135) mol NaCl = 2.269 mol NaCl
mass NaCl = 2.269 mol NaCl x 58 g/mol = 131.61 g ≅ 132 g consumed at 1.5 Atm & 290K
Given 18L F₂(g) - same volume as in part a - at STP
moles F₂(g) = PV/RT = (1.0Atm)(18L)/(0.08206L·Atm/mol·K)(273K) = 0.803 mol F₂(g) consumed
moles NaCl consumed = 2(moles F₂) = 2(0.803) mole NaCl = 1.607 mol NaCl
mass NaCl = 1.607 mol NaCl x 58 g/mol = 93.2 g NaCl consumed at STP