Multiple Choice
What is the percent by mass of chlorine in FeCl_3?
70
views
3. Chemical Reactions
Mass Percent
Multiple Choice
Which one of the following compounds has the smallest mass percent of fluorine (F)?
A
HF
B
NaF
C
CaF2
D
SF6
Verified step by step guidance1
Identify the molecular formula of each compound and determine the number of fluorine (F) atoms in each: HF has 1 F atom, NaF has 1 F atom, CaF2 has 2 F atoms, and SF6 has 6 F atoms.
Calculate the molar mass of each compound by summing the atomic masses of all atoms present. Use atomic masses approximately as: H = 1 g/mol, Na = 23 g/mol, Ca = 40 g/mol, S = 32 g/mol, and F = 19 g/mol.
Calculate the total mass contributed by fluorine atoms in each compound by multiplying the number of fluorine atoms by the atomic mass of fluorine (19 g/mol).
Determine the mass percent of fluorine in each compound using the formula: \(\text{Mass \% of F} = \left( \frac{\text{Mass of F in compound}}{\text{Molar mass of compound}} \right) \times 100\).
Compare the mass percent values calculated for each compound to identify which one has the smallest mass percent of fluorine.
Related Videos
Related Practice
