Ideal Gas Law: A jar holds 2.0 L of ideal nitrogen gas, N2, at STP. The atomic mass of nitrogen is 14.0 g/mol, the ideal gas constant is R = 8.31 J/mol ? K, Avogadro's number is NA = 6.022 × 1023 molecules/mol, and 1.00 atm = 101 kPa.(a) How many moles of nitrogen are in the jar?(b) How many nitrogen molecules are in the jar?(c) What is the mass of the nitrogen in the jar?
What will be an ideal response?
(a) 0.089 mol (b) 5.4 × 1022 molecules (c) 2.5 g
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If the principal quantum number (n) is equal to 3, which of the following angular momentum quantum numbers (l) is not allowed?
(a) 0 (b) 1 (c) 2 (d) 3
Chemically, clean [non-polluted] air is
A) an element. B) a mixture. C) a compound. D) an isotope.
Five equal negative charges are uniformly spaced in a semicircular arc of radius r0 with its center at the origin. The charges positions in polar coordinates are given by (r0, ?i), where the values of ?i are 0°, 45°, 90°, 135°, and 180°. At the position (x, y) = (r0, –r0) in the 4th quadrant, which statement best describes the direction of the resulting electric field?
a. The direction is that of a 4th quadrant angle. b. The direction is that of a 3rd quadrant angle. c. The direction is that of a 1st quadrant angle. d. The direction is that of a 2nd quadrant angle.
If you began at rest and ended at rest and the average speed of your trip was 10 kph, that means:
a. for most of the trip, you were going 10 kph. b. sometimes you were going faster than 10 kph. c. 10 kph was the fastest you ever went. d. 10 kph was the slowest you ever went. e. you traveled at constant speed throughout the trip.