In an experiment, mixing baking soda and vinegar produced a combination of salty liquid and carbon dioxide as shown in the following graph. What was the combined mass of the baking soda and vinegar before mixing?
Unfortunately, I cannot see the graph you mentioned, so I cannot determine the combined mass of baking soda and vinegar before mixing based solely on that information. However, I can provide you with the general stoichiometry of the reaction between baking soda (sodium bicarbonate) and vinegar (acetic acid) and explain how to calculate the theoretical combined mass.
The reaction between baking soda and vinegar can be represented by the following balanced chemical equation:
NaHCO3 + HC2H3O2 -> NaC2H3O2 + H2O + CO2
According to this equation, one mole of sodium bicarbonate (molar mass: 84.01 g/mol) reacts with one mole of acetic acid (molar mass: 60.05 g/mol) to produce one mole of sodium acetate (molar mass: 82.03 g/mol), one mole of water, and one mole of carbon dioxide (molar mass: 44.01 g/mol).
To calculate the theoretical combined mass of baking soda and vinegar before mixing, you need to know the number of moles of each substance. Without additional information, it is not possible to determine the combined mass precisely.
However, if you have the mass of either baking soda or vinegar before mixing, you can convert that mass into moles using the substance's molar mass. Then, assuming the reaction went to completion, you can use the stoichiometry of the balanced equation to find the number of moles of the other substance involved. Finally, you can convert the moles back into mass using the molar mass of the respective substance.
Please provide the mass of either baking soda or vinegar if you want a more specific calculation.