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Chemistry

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please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab.
In this case mass/moles of NaCl.
NaHCO3+ HCl--> NaCl + CO2 + H2O

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    what is the density of an object having a mass of 5.0g and the volume of 45.0cm^3?

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