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# Workshop 5 answer - 4NH 3 5O 2 → 4NO 6 H 2 O n(NH 3 =...

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NAMES: ____________________________________________________________ WORKSHOP 5 (20 points) Gasses Spring 2011 1. (3 pts) A 5.0 L cylinder contains oxygen gas at 20.0°C and 735 mm Hg. How many grams of oxygen are in the cylinder? P= 735mmHg= 0.967 atm n= PV/RT m= MM*n= 32g/mol * 0.20 mol = 6.4 g 2. (5 pts) Write the correct order of increasing density for N 2 , NO 2 , NH 3 . The temperature and pressure are same for all three samples. NH 3 , N 2 , NO 2 P,T=constant so d= m/V , m = n*MM, n= PV/RT, d= (PV/RT*MM )/V = (P/RT)* MM , P/RT= constant , so when molar mass is greater the density is greater . so NO 2 has the highest density. 3. (3 pts) What volume of NO can be produced at 1.0 atm and 1000. ºC when 10.0 L of NH 3 and 10.0 L of O 2 are reacted at the same temperature and pressure?

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Unformatted text preview: 4NH 3 + 5O 2 → 4NO + 6 H 2 O n (NH 3 ) = PV/RT= 0.0957 mol n (O 2 )= 0.0957 mol ratio 1 to 1 for NH 3 to NO, n (NO)= 0.0957 mol ratio 5 to 4 for O 2 to NO , n(NO)= 0.0765mol V= nRT/P= 8 L 4. (3 pts) If 10g of Zn is treated with excess of HCl, what volume of hydrogen gas is evolved at STP? Zn + 2 HCl → ZnCl 2 + H 2 n (Zn) = 10g/ 65.3 g/mol= 0.153 mol ratio 1 to 1 so 0.152 mol of H 2 V= 3.4L at STP 5.(3 pts) What is the volume of 1.42 mol of ammonia at STP? V= nRT/P= 31.8 L 6. (3.pts)What is the final volume of a 400.0 mL gas sample that is subjected to a temperature change from 22.0 °C to 30.0 °C and a pressure change from 760.0 mm Hg to 360.0 mm Hg? V 2 =(P 1 V 1 T 2 )/ (T 1 P 2 ) = 0.867 L= 867 mL...
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Workshop 5 answer - 4NH 3 5O 2 → 4NO 6 H 2 O n(NH 3 =...

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