40. How much does 1.050 moles of Nacl weigh? 35. Which of the following ionic so

Question

40. How much does 1.050 moles of Nacl weigh? 35. Which of the following ionic solids would you expect to (a) 1.050 g be the least soluble in water? b) 22.99 g a) Cao (c) 55.66 g (b) NH4Br (d) 58.44 g c) KOH e) 61.36 g (d) NaHCO3 e) CaCl2 41. what is the frequency of light that has a wavelength of 650 nm? 36. The atomic weight of the fictitious element Professsorium is 123.45. what is the mass of one a) 2.2x10 15 /s Professorium atom in grams? (b) 200 /s (a) 1.3451x10 26 g (c) 4.6x105 /s (b) 1.660 5x10 24 g (d) 2.0x1011 /s (c) 2.0499x 10-22 g e) 4.6x1014 /s (d) 123.45 g 42. What is the molar mass of CaCO3? (e) 6.022x10 23 g (a) 100.06 g/mol 37. How much does one mole of Au weigh? (b) 112.07 g/mol (a) 3.27x10 22 g (c) 124.08 g/mol (b) 1.00 g exactly; one mole of any element weighs (d) 156.13 g/mo the same (e) 160.04 g/mo c) 79.0 g d) 197.0 g 43. What is the electron configuration of N? (e) 6.022 x1023 g a) 1s2 1p b) 1s6 2s 38. In the reaction CH4(g) 2 o2(g) co2(g) 2 H2O(l), 1s2 2p5 which reactant is limiting if the reaction starts with 1.89 moles of CH4 and 3.75 moles of O2? (d) 1s2 2s2 2p3 a) CH e) 1s2 2s2 2p 44. Which one of the following is a molecular compound? c) CO2 a) NaOH d) H20 b) FeCl these are e) There miting reactant no c) NH3 stoichiometric quantities (d) PbO hich one of the following is a false statement about 39. the Bohr model of the atom? (a) Electrons orbit the nucleus in circles. (b) The potential energy of the orbits increases as the orbit diameter increases. (c) Electrons in Bohr atoms can possess any energy. (d) orbits are identified by a quantum number, n, that increases with distance from the nucleus. (e) The Bohr model correctly predicts the colors of light emitted by H atoms. Page 5 of 8

Explanation / Answer

35.d

36.c

37.d

38.b O2 produces 1.87 moles of CO2

39.c

40.e

41.e

42.a

43.d

44.c since it contains N and H atoms

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