2.02 g of hydrogen gas occupies 22.428 L. Although the volume of the gas contain

Question

2.02 g of hydrogen gas occupies 22.428 L. Although the volume of the gas contains significant digits the density of the gas (2.02 g/22.428 L = 0.900659 g/L) should be reported as: a. 3, 0.090 g/L b. 3, 0.0901 g/L c. 3. 0.09 g/L d 5, 0.0900659 g/L e, 3, 0.090 g/L In Bohr's theory the energy of a photon of light emitted when an electron moves from n = 4 ton n = 2 would be. a 21B/100 b. (B/2.-B/4) c. 29B d. 3B/16 e. 7B/11 Valence bond theory is useful because a. it describes covalent bonding as the result of the overlap of orbitals of two atoms. b, it describes the bonding in solids only, like salts and metals c. it explains the lack of triple bonds in liquids and gases d. it utilizes only s, and p atomic orbitals to describe covalent bonding e, it does all of the above Which is the greatest pressure: d. 570 torr b, 1.00 atm c. 8.9 g/ml. d. 101 m e, 699 mm Hg The alkali metals are the electron block elements a. ns' b. ns^2 c. np^2 d. nd e. nf The molecular weight (in amu) of nitrobenzene, C_6H_5NO_2, is 107.11 b) 43.03 c) 109.10 d) 127.42 e)123.11 Which of the following is greatest? a. 0.010 kg b. 100.0 cg c. 1.000 g d. 1000 mg e, 1000,000 mu g Which of the following is NOT a characteristic property of a substance? a. density b, melting poin c. mass d. specific heat e, boiling point We know that air is a mixture and not a compound because a. it is colorless b. it can be compressed c, its composition can vary d. it has no mass e, it can be heated Which of the following processes is NOT an example of a physical change? a. Condensation of moisture on a cold surface in a humid room b. Formation of a salt by evaporation of sea water, c. Separation of a solid from a liquid by filtration d. The burning of wood. e. Evaporating water at 100 degree C How many grams of hydrogen would combine with 6.0 g of carbon to form the compound ethylene C_2H_4? a. 1.0g b, 2.0 g c. 4.0 g d. 8.0 g e, 10 g Which of the following is NOT a correct description of 17.0 g of ainmonia, NH_3 a. The amount of ammonia that contains three moles of hydrogen. b. one mole of ammonia. c, the amount of ammonia that contains 14.0 g of nitrogen d. 17.0 times 6.022 times 10^23 molecules of ammonia. e. Avogadro number of ammonia molecules

Explanation / Answer

Q7.

m = 2.02 g of H2

V = 22.428 L

recall the number of sig fig.

3 sig fig for mass

4 sig fig for volume

since this is a division, we must keep the least amount of sig. fig

so choose 3 sig fig

D = 0.090069.... we must round up to

D = 0.09006

the last zero mis the third sig fig. we msut roudn it up so

D = 0.0901

must be rounded up to 0.0901or 9.001*10^-2

from the list, choose B

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