Question

31). 31) To convert a given number of moles into the number of atoms, one would multiply by which of the following factors? A) 1.66 x 10-24 atoms/1 mol B) 1 mol/6.022 x 1023 atoms C) molar mass D) 6.022 x 1023 atoms/1 mol E) 1 mol/1.66 x 10-24 atoms 32) 32) How many atoms of sulfur are present in a 155 g sample of sulfur? [Molar mass: S, 32.06 g/mol] A) 6.02 x 1023 atoms B) 2.91 x 1023 atoms C) 2.01 x 1023 atoms D) 2.91 x 1024 atoms E) 3.01 x 1023 atoms 33). 33) What is the formula mass of carbon dioxide? [Atomic masses: C, 12.01 amu; O. 16.00 amu A) 44.01 g B) 44.01 amu C) 28.01 g D) 28.01 amu E) 44.01 mol 34) 34) What is the mass of a 0.0200 mol sample of nicotine? [Formula mass: nicotine, 162.2 amu] A) 8.11 103g B) 32.4 g C) 3.24 g D) 1.23 x 10-48 E) 0.308 g 35) 35) The chemical equation below is not balanced. What is the coefficient of iron when the equation is balanced with smallest whole number coefficients? Fe(s) + O2(g) → Fe2O3(s) A) 4 B) 8 C1 D) 3 E) 2

Answer 1

Dete: Ilven number of moly to atom To conveut given number of moly we would multiply it by Imole = 6.023x1023 atans . Option 'Di 2 mat x 6.023x1023 atam & C ) arom. I mod man of Sulur Molar malt = = 1559 32.06 g/mol mol e of Sulfur - 155 g = 4.834 mor 32:06 g/mol - no. of atony = 4.B 384 med x 6.023x123 atm I mot = 2.91x1024 atoms option 'B