28 Sep One half of a mole of atoms would contain how many atoms?

CHEM1305 Introductory Chemistry

Chapter 8 Homework Assignment  

Question 1One half of a mole of atoms would contain how many atoms?

  6.02 × 1023 atoms

 

  6 atoms

 

  3.01 × 1023 atoms

 

  144 atoms

 

 Question 2Calculate the number of particles in 0.200 mol of chlorine molecules, Cl2.

 

  6.02 × 1023 molecules

 

  7.09 molecules

 

  35.45 molecules

 

  1.2 × 1023 molecules

 

 Question 3Calculate the number of moles in 3.00 × 1024 formula units of manganese(II) sulfate, MnSO4.

 

  151.00 moles

 

  4.98 moles

 

  6.02 × 1023 moles

 

  2.00 × 1023 moles

 

 Question 4Determine the molar mass for each of the following:

 

a) silicon, Si28.09 g/mol

 

b) ozone, O348.0 g/mol

 

c) iron(II) acetate, Fe(C2H3O2)2173.93 g/mol

 

d) nitroglycerin, C3H5O3(NO2)3227.09 g/mol

 

Question 5How many moles of dinitrogen oxide, N2O are in a 19.3 g sample of N2O?

 

  6.43 moles

 

  2.28 moles

 

  0.439 moles

 

  19.3 moles

 

 Question 6What is the mass of 61.5 moles of zinc, Zn?

 

  0.941 g

 

  1.06 g

 

  4021 g

 

  61.5 g

 

 Question 7Calculate the number of molecules in 5.68 g propane, C3H8.

 

  7.75 × 1022 molecules

 

  0.129 molecules

 

  2.33 × 1024 molecules

 

  5.68 molecules

 

 Question 8What is the mass percent of C in oxalic acid, H2C2O4?

 

  12.01 %

 

  26.7 %

 

  13.3 %

 

  33.3 %

 

 Question 9An iron phosphide compound contains 335 grams of iron and 124 grams of phosphorus. What is the empirical formula of this compound?

 

  Fe6P4

 

  FeP

 

  Fe3P2

 

 Question 10Hexamethylene diamine has a molar mass of 115 g/mol and an empirical formula of C3H8N. What is the molecular formula of the compound?

 

Correct!

 

  C6H16N2

 

  C9H24N3

 

  C3H8N

 

  C1.5H4N0.5