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1. Consider the molecule Al2(SO4)3.?
1. Consider the molecule Al2(SO4)3.
A) How many aluminum atoms are there in a single molecule?
B) How many O atoms are there in a single molecule?
C) Find the molar mass of this substance.
D) What is the mass of one mole of this substance measured in grams?
E) What is the mass of one molecule of this substance measured in atomic mass units?
1 Answer
- Anonymous1 decade agoFavorite Answer
Consider your formula. It will give you A & B.
the subscript numbers in a formula tell you how many of that atom there are. In the case of a molecule like SO4, you have 1 S & 4 O, for each molecule. If SO4 is in parentheses with a number outside it (SO4)3, you have 3 whole molecules SO4.
To find molar mass in grams and atomic mass units (same number, different unit) - C & E
Go to the periodic table and write down the number on the bottom of each square for the elements in the formula
Al = 27
S = 32
O = 16
your formula is Al2(SO4)3
Al = 2 x 27 = 52
S = 3 x 32 = 96
O = 16 x 12 = 192
Do the math. 52+96+192 is?
The formula weight IS the mass of 1 mole in grams (D=C)
Hope this helps!
Source(s): http://www.ptable.com/ this table comes in handy!