Chem 211 Review Ch3&4

Which of the following has the largest percent carbon by mass?

• C₃H₆

• C₈H₁₈

• C₂H₆

• C₆H₁₀

A and B₃ react according to the following reaction

6A + B₃--> 3A₂B

If 4.5mol of A is mixed with 3.3mol of B₃, how much A2B is made?

• 4.5mol

• 3.3mol

• 2.3mol

• 9.9mol

What is the empirical formula if a compound contains 37.5%C, 50.0%O, and 12.5%H?

• CH₄O

• C₃O₄H₁

• C₂H₄O

• C₃H₁O₂

An old unmarked chemical container is found. The solid inside is blue and has a melting point somewhere higher than 1000^oC. Which of the following could the chemical be?

• CoCl₂

• Na₂O

• C₅H₁₂

• Ar