TEST Ch 10 Moles- Part B Math 1. How many moles and grams of gold (MM- 197) are found in 3.01 x 10^22 particles of
gold-
2. How many moles and liters of CO2 (MM-44) gas at STP are in 110 g -
3. What is the percent composition of each element in CaCO3-
Ca-
C-
0
4. What is the empirical formula of a compound that is 27.3% carbon and 72.7% oxygen-
C=
O-
5. Find the molecular formula of a compound with a molecule mass of 330 grams and an
empirical formula of P203-
6. How many grams of aluminum are in 100 g of A1203-
7. What is the density of Co, carbon monoxide gas-

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explanation:

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

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