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Unformatted text preview: → 2Fe(s) + 3CO2(g) ∆H = -24.8 kJ exothermic 10. What is the total mass of oxygen in grams in a room measuring 4.0 m by 5.0 m by 2.5 m?
Assume that the gas is at STP and that the air contains 20.95 % oxygen by moles.
R = 0.0821 Latm/molK
V = 400 cm x 500 cm x 250 cm = 5.00 x 107 cm3 = 5.00 x 104 L XO2 = 467.3 mol 11. Extra Credit. List the following elements in order of decreasing atomic radii from left to
right. (5 pts)
P, K, Al, He, F
K > Al > P > F > He
decreasing Chemistry 101 Exam 2...
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