Question 28
MA2B2 is a molecule where M is the centralatom bonded to 2 atoms of A and 2 atoms of B. The fact that itexists in only one form (no isomers) suggests its geometry is
Select one:
a. octahedral
b. square planar
c. tetrahedral
d. trigonal planar
Question 29
A compound is found to consist of 28.1% sodium, 13.2% boron and58.7% oxygen. What is its simplest formula?
Select one:
a. NaBO2
b. NaBO3
c. Na2B4O7
d. Na3BO3
Question 30
What mass of carbon is present in 0.500 mol of phenol(C6H5OH)?
Select one:
a. 94 g
b. 47 g
c. 36 g
d. 6 g
Question 31
A 4.000 g sample of an unknown metal, M, was completely burnedin excess O2 to yield 0.02225 mol of the metal oxide,M2O3. What is the metal?
Select one:
a. Y
b. Ca
c. Al
d. Sc
Question 32
What is the maximum mass in grams of aluminum chloride thatcould be obtained from 2.50 mol of barium chloride and excessaluminum sulfate? This is the balanced equation for the reaction:Al2(SO4)3 +3BaCl2--> 3BaSO4 + 2AlCl3.BaCl2molar mass is 208.3 g/mol and AlCl3molarmass is 133.3 g/mol.
Select one:
a. 521 g
b. 334 g
c. 222 g
d. 55.8
Question 33
1.0 x 10-5 g sample of a compound is known to contain1.36 x 1017 molecules. This compound is
Select one:
a. CO2
b. CH4
c. NH3
d. H2O
