Moles, Mathematics of Chemistry. Chemical Symbols. Fe. C. Each element has been assigned a unique one-, two-, or three-letter symbol for its identification The first letter of a symbol is always capitalized
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Mathematics of Chemistry
Gram Atomic Mass
Formula Mass / Molecular Mass
(To the nearest tenth)
Gram Formula Mass
1.0 mole of CO2 = 44g
1. 1.5 moles of CO2 = _______ g
2. 24 g of C = _______ moles
3. 3.0 moles of Br = _______ g
4. 5.0 g of Al = _______ moles
Mole – Volume Calculations
1. 1.5 moles of CO2 (g) = _______ L
2. 38 L of Ne(g) = _______ moles
3. 3.0 moles of O2(g) = _______ L
4. 11 L of N2(g) = _______ moles
Mole – Number Calculations
A compound has a molecular mass of 180amu and an empirical formula of CH2O. What is its molecular formula?
What is the empirical formula of a compound that consists of 58.80% barium, 13.75% sulfur, and 27.45% oxygen by mass?
Types of Reactions
A + B AB
2H2(g) + O2(g) 2H2O(l)
AB A + B
2H2O(l) 2H2(g) + O2(g)
A + BC B + AC
Cu(s) + 2AgNO3(aq) 2Ag(s) + Cu(NO3)2
*copper replaces silver
AB + CD AD + CB
AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq)
Example: 2H2 + O2 2H2O
If 103.0g of potassium chlorate (KClO3) are decomposed to form 62.7g of potassium chloride (KCl) and oxygen gas (O2) according to the equation 2KClO3 2KCl + 3O2, how many grams of oxygen are formed?
(Hint: Remember the mass of the products must equal the mass of the reactants)
How many grams of Fe are needed to react with 8.0g of O2 to produce 28.9g of Fe3O4 according to the equation 3Fe + 2O2 Fe3O4?
Given the following reaction answer the questions below:
2C2H6 + 7O2 4CO2 + 6H2O
Given the following reaction:
____ H2 + ____ Cl2 _____ HCl
Use the balanced equation to answer the questions below:
____ C2H4 + ____ O2 ____ CO2 + ____ H2O