WorksheetsDo Now - AP - Mass Spec and % Composition
Total questions: 10
Worksheet time: 7mins
The following is a mass spectroscopy graph of a diatomic molecule and it the atom that makes it up. Which diatomic molecule and its molecule does this encompass?
Cl2 and Cl
O2 and O
F2 and F
Ne2 and Ne
Use the relative abundance data, to calculate the average atomic mass of this sample of Ag.
107.96
108.85
107.44
108.26
107.94
An element consists of 62.60% of an isotope with mass 186.956 amu and 37.40% of an isotope with mass 184.953 amu. Calculate the average atomic mass and identify the element. (Do not write name, only symbol.. e.g. H for Hydrogen)
(a)
A sample of an unstable gas was analyzed and found to contain 2.70 g of C and 15.95 g of Cl. What is the empirical formula of this molecule?
CCl6
CCl2
C6Cl
C2Cl
The empirical formula should've been CCl2. If the molar mass of the compound is 160 g/mole, what is the formula unit?
CCl4
C2Cl
C2Cl4
C2Cl3
Sodium Sulfate forms several hydrates (molecules that become stable in solid form by bonding to water molecules). A sample of a hydrate is heated until all the water is removed. Which formula would lose the largest percentage of its mass?
NaSO4 H2O
NaSO4 2H2O
NaSO4 8H2O
NaSO4 6H2O
Sodium Sulfate forms several hydrates. A sample of a hydrate is heated until all the water is removed. Which formula would 43% of its mass? NaSO4 = 119.05 g/mole
NaSO4 H2O
NaSO4 2H2O
NaSO4 8H2O
NaSO4 6H2O
For which of the following substances is the formula mass (molar mass) the same for both empirical and molecular formulas?
C2H4O2
C6H12O6
CO2
H2O2
