Help , I HONESTLY DONT UNDERSTAND MOLES .

1 .What is the mass of 1 mole of H2O2 =
2. Calculate the mass of 1 mole of Al2(SO4)3 =
3 . What is the mass of 1 mole of NO2 =
4 . How many moles are in 15 grams of lithium
15g Li x ___________ = ______ moles Li

5 . What is the mass of 2.4 moles of sulfur ?
2.4 mole S x _________ = ____ g S

6 . How many atoms are in 5.0 moles of neon ?
5.0 moles Ne x ___________ = ____ atoms of Ne

7. how many moles are in 22 grams of argon ?
22 grams Ar x _________ = _____ moles Ar

8. How many molecules are in 3 moles of NaCl?
3 moles NaCl x ___________ = ___ molecules NaCl

9. How many atoms are in 36.03 grams of carbon ?
36.03 C x _____________ x _______________ = atoms C

10 . What is the mass of 1.2 x 10^24 molecules of H2O ?
1.2 x 10 ^24 molecules H2O x __________ x ____________ = g H2O

1. 34g
2. 342g
3. 46g
4. 2.17moles Li
5. 76.8g
6. 3 x 10^24atoms
7. .55moles
8. 1.8 x 10^24
9. 1.8 x 10^24atomsC
10. 35.9g H2O

6.02 x 10^23 molecules = 1 mole

1 mole is equal to the molar mass of a substance.
Molar mass can be found on most/all periodic tables for every element. Example can be hydrogen has a molar mass of 1.007 and a few more digits.

Now, if you are given 15g of lithium you need to find molar mass.

Base equation for anything to do with # of moles, molar mass and a mass is:

n=m/M
n=number of moles
m=mass
M=molar mass

rearrange according to what you're solving for.

So, for 15 grams of lithium:
n=15g divided by 6.94 g/mol
=2.16 moles Li

Now for # of molecules which is what other questions are asking, just take you number of moles and multiply by avegadros' number: 6.02 x 10^23

can someone pretty pretty please help me with my chemistry!!!


At 1280 degrees celcius constant (Kc) for the reaction