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- To determine the mass of a reactant, write the balanced chemical equation, determine the molar masses, use stoichiometry to relate moles of reactants, and calculate the mass needed.
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Using the Law of Conservation, we know that the mass before a reaction must equal the mass after a reaction. With this we can use the difference of the final mass of products and initial mass of the unknown organic molecule to determine the mass of the O 2 reactant. 0.333mol CO 2 (44.0098g CO 2 / 1mol CO 2) = 1.466g CO 2
- 3.8 Balancing Chemical Equations
Figure \(\PageIndex{1}\): A Flowchart for Stoichiometric...
- Law of Conservation of Mass
Mass of the products: \(4.4 \,g+ 5.6\, g = 10\, g\). Because...
- 6.3: Mass Calculations
Using this approach, the mass of a reactant can be inserted...
- 3.8 Balancing Chemical Equations
The general method for converting from the mass of any reactant or product to the mass of any other reactant or product using a balanced chemical equation is outlined in and described in the following text.
Using this approach, the mass of a reactant can be inserted into our reaction pathway as the ratio of mass-to-molar mass. This is shown here for the reduction of 1.0 gram of Fe 2 O 3 . \[Given:\left ( \frac{1.0g\: Fe_{2}O_{3}}{159.70\frac{g\: Fe_{2}O_{3}}{mol\: Fe_{2}O_{3}}} \right )\; \; Find: x\: mol\: Fe \nonumber \]
To perform a stoichiometric calculation, enter an equation of a chemical reaction and press the Start button. The reactants and products, along with their coefficients will appear above. Enter any known value. The remaining values will automatically be calculated.
The first step in determining the mass of a reactant is to write and balance the chemical equation for the reaction. A balanced equation ensures that the number of atoms for each element is the same on both sides of the equation. For example, consider the reaction between hydrogen and oxygen to form water:
Mar 1, 2019 · Step 1: Write out the reaction as an equation with the correct chemical formulas. Step 2: Balance the equation using stoichiometric coefficients. Step 3: Work out the molar mass of the substance you know the mass of. In this example that would be sodium nitrate.
Determine the number of moles of each reactant. Compare the mole ratio of the reactants with the ratio in the balanced chemical equation to determine which reactant is limiting. Calculate the number of moles of product that can be obtained from the limiting reactant.
