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Can anyone help me with some highschool chemistry?

T

theMan

Diamond Member
Can someone please help me with this chemistry? I missed a couple days of class and I have no idea how to do some of this homework. Ok, here are some of the questions.

1. How many mulecules (or formula units are present in 1.00g of each of the following: P4O6, Ca3(PO4)2, Na2HPO4. how do you do this?

2. how many moles are represented by each of these samples: 150.0g Fe2O3, 10mg NO2.

3. Determine that mass in grams of the following: 3x10^20 N2 Molecules, 1.5x10^2 moles N2


Hope you guys can help me, im really lost. Also, the numbers are supposed to be subscript of course. Thanks in advance.

THEMAN
 
I bet your teacher would know the answers.

Edit: Here's a hint - You need the molecular weight of each molecule to figure these problems out.
 
man, you guys are harsh. those are only 3 out of 40 probs i have to do, so you arent doing it for me. anyway, called a friend and asked. hes really bad at explaining stuff, but, i think i figured it out. btw, the book is terrible, it doesnt explain anything. yeah, and we have a quiz tomorrow so, its a bit late to ask. well, i guess asking here was a worth a try...
 
1. Use your reference table and calculate the mass of each molecule. divide the given mass by that number.

2. the masses in the ref table = 1 mole of that element.

3. 1 mole = 6.02 x 10^23. plug it in.

simple math.
 
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