Question
Calculate the density of butane gas, at 15degree C and 0.950_____4.85 g/L 0.442 g/L 1.250 g/L 2.20 g/L Calculate the squareroot-mean-square speed of an oxygen molecules at 0degree C_____2.12 times 10^5 m/s 1.45 m/s 401 m/s 285 m/s If it takes 30 seconds for 10.00mL of N_2 to effuse from a container, how long will it take the same amount of H_2 to effuse out of the same container?_____16 seconds 110 seconds 8.0 seconds 2.1 seconds How much work is done by a system when its volume increases from 4.54 L to 18.30L against a constant external pressure of 1.12 atm? [1L atm = 101.325 J]_____-1.21 KJ -1.56 KJ 15.4 KJ -12.3 KJ When hydrogen gas reacts with sulfur, H_2 S is formed. When 1.20 grams of sulfur are reacted with excess hydrogen, -0.770 KJ of heat are released. How much heat is released when 2.50 moles of sulfur are reacted with excess hydrogen gas?_____-103 KJ 20.6 KJ -22.4 KJ -51.5 KJ Part of the process of recovering zinc metal from zinc sulfide are in depicted in the following chemical equation, 2 ZnS(s) + 3 O_2(g) rightarrow 2 ZnO(s) + 2 SO_2(g) What is the work done on this system if 20.0 grams of zinc sulfide ar e reacted with excess oxygen at 298 K? [R = 8.3145 J mol^-1 K^-1]_____2.51 J 254 J 762 J 508 J A system at constant pressure produce -5.0 j of heat. What is delta H for this system?_____0.0 J it depends on the work performed -5.0 J 5.0 J The oxidation of iron metal by oxygen produces iron(III) oxide according to the following equation. 4Fe(s) +3 O_2(g) rightarrow 2 Fe_2 O_3(s) deltaH = -1648 KJ mol^-1 Calculate the energy released when this reaction produces 25.0 grams of iron(III) oxide at constant pressure._____-65.9 KJ -129 KJ -258 KJ -4.12 times 10^4 KJ
Explanation / Answer
17.
PV = nRT
n = m/MW
D = M/V
D = P*MW/(RT)
D = 0.95*58.12/(0.082*(15+273)) = 2.3379 g/L
