Module 3.1 Molecular Weight Flashcards
1
Q
What is the Molecular Weight of
Ca₃(PO₄)₂
A
First layout the number of atoms 3 Ca 2 P 8 O Then multiply by the mass (periodic table) 3 Ca * 40.08 = 120.24 2 P * 30.97 = 61.94 8 O * 16 = 128
Add together 120.24+61.94+128= 310.18
2
Q
What is the Molecular Weight of
C₃H₅O₂Cl
A
Layout each one 3 C 5 H 2 O 1 Cl Find mass on periodic table & multiply 3 C * 12.01 = 36.03 5 H * 1.008 = 5.04 2 O * 16 = 32 1 Cl * 35.45 = 36.45
Add together
36.03+5.04+32+36.45= 108.52
3
Q
What is the Molecular Weight of
Al₂(SO₄)₃
A
First layout 2 Al 3 S 12 O Find mass on periodic table and multiply 2 Al * 26.98 = 53.96 3 S * 32.06 = 96.18 12 O * 16 = 192
And together
53.96+96.18+192= 342.14