Homework Help: chemistry

Posted by please help on Tuesday, April 17, 2012 at 10:14pm.

Find the formula mass of the compound
H2SO4.
1. 98.09 amu
2. 96.07 amu
3. 97.08 amu
4. 81.08 amu
5. 89.09 amu

chemistry - DrBob222, Tuesday, April 17, 2012 at 11:00pm
Look on the periodic table and add everything.
2*H + 1*S + 4*O = ?
chemistry - please help, Tuesday, April 17, 2012 at 11:18pm
how would you do 3PO-4
chemistry - DrBob222, Tuesday, April 17, 2012 at 11:22pm
Is that 3PO^-4 or 3(PO4)^3-
chemistry - please help, Tuesday, April 17, 2012 at 11:31pm
PO3-
4
chemistry - DrBob222, Tuesday, April 17, 2012 at 11:41pm
I can't tell what you mean.
PO₃^-4 is
1*P + 3*O
A number as a subscript means you multiply what it is a subscript to by that number.
P₂ is 2*P
PO^{4 is

1P + 4*O

H3PO4 is

3*H + 1*P + 4*O

If there are parentheses, the subsceript multiplies everything in the parentheses by that number.

Ba3(PO4)2 is

3*Ba + 2*P + 8*O

A number as a coefficient multiplies the entire molecule by that number

2NaCl is 2Na + 2Cl

or

2Na2SO4 is

4*Na + 2*S + 8*O}

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