6 A student records the mass of a sample of polyvinyl chloride (PVC) as 75.23 grams. Then the student places the PVC sample into a graduated cylinder containing 25.0 mL
of water. The student reads the new volume in the graduated cylinder to be 78.0 mL. What is the percent error for
the student's density determination? The accepted value for the density of polyvinyl chloride is 1.38 g/cm3.
A 1.42%
B 2.86%
C 3.00%
D 4.00%

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.

How many moles of oxygen react with 12 moles of aluminum

An atom that gains or loses one or more electrons is called a(n)