Chapter 3. Formulas, Equations, and Moles. 3.1 Balancing Equation. Balancing Equations. Chemical Reaction Reactants Products Steps: Write the unbalance equation Find an appropriate coefficient and place in front of the formula unit to balance the equation
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E.gMolecular weightMolar Mass
18.02 amu18.02 g/mol
How many moles of sucrose are in a table spoon of sugar that contains 2.85 g? The molar mass of sucrose is 342.0 g/mol
…..NaOH(aq) + ….Cl2(g) …NaOCl(aq) + NaCl(aq) + ….H2O(l)
How many gram of NaOH are needed to react with 2.5g Cl2?
2 Mg(s) + O2(g) 2 MgO(s)
2 NO(g) + 5 H2(g) 2 NH3(g) + 2H2O(g)
Atomic mass of an element
Molar mass of the compound
( # of empirical unit) Molecular mass
71.65 % Cl24.27 % C4.07 % H
The molar mass is known to be 98.96 g/mol. Determine the empirical formula and the molecular formula for this compound
CxHyOz (O can be replaced with any other element)
(Chapter 1-3, except 3.7-3.10)