Looking at the reaction N2 + O2 → 2NO at 25°C, AH = +1.81 KJmol. Wh.at will be
if the system is cooled? (A) The equilibrium will shift to the right (B) the system will remain at equilibri
equilibrium will shift to the left (D) the equilibrium will be at constant rate
36. How many moles are there in 2.5 kg of magnesium? (Mg = 24.3 g/mol) (A) 0.5 mol (B) 24.3 mol (C) 0.
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Ответ:
(a) Yes (21.33 mg/L ≈ 21 mg/L)
(b) 15.5 metric ton/d ≈ 16 metric ton/d
Explanation:
q1= Volumetric flow rate of stream
q2= Volumetric flow of road runoff pipe
p1= Chloride concentration of stream
p2 =Chloride concentration of road runoff pipe
p3 = Chloride concentration of mixture downstream ( mixture of stream and road runoff pipe)
p4 = Standard Chloride concentration
From the question:
q1= 10 m3/s or 10,000 L/s p1 = 12 mg/L p3 = ?
q2= 5 m3/s or 5,000 L/s p2= 40 mg/L p4 = 20 mg/L
(a) Using the Law of Conservation of Mass (Chloride):
(p1 x q1) + (p2 x q2) = (q1 + q2) p3 (1)
( 12 x 10,000) + (40 x 5,000) = ( 10,000 + 5,000) x p3
120,000 + 200,000 = 15,000 x p3
320,000 = 15,000 x p3
p3 = 320,000/15,000
= 21.33
≈ 21 mg/L
This concentration is above the standard quality concentration for Chloride.
(b) Rearranging equation (1), and making the Road Runoff pipe (q1 x p1) the subject of the formula, we have :
Runoff pipe (max) = p4 x (q1 +q2) - (q1 x p1)
= 20 x (10,000 + 5,000) - (10,000 x 12)
= 20 x ( 15,000) - 120,000
= 300,000 - 120,000
= 180,000 mg/s
= 180 g/s
= 0.18kg/s
=0.00018 metric ton/ s
To convert to metric ton/d we multiply by 86,400
= 0.00018 x 86,400 metric ton/d
= 15.552 metric ton/d
≈ 16 metric ton/d