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Use your knowledge of the law of conservation of mass to answer the following question: From a laboratory process, a student collects 28.0 g of hydrogen and 224.0 g of oxygen. (Water -----> Hydrogen + Oxygen) How much water was originally involved in the process? (1 point)

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Answer:

[tex]\boxed{\text{252.0 g}}[/tex]

Explanation:

                  water ⟶ hydrogen + oxygen

mass/g:          x               28.0         224.0

According to the Law of Conservation of Mass,

[tex]\begin{array}{rcl}\\\text{Mass of reactants} & = & \text{mass of products} \\\text{Mass of water} & = & \text{mass of hydrogen + mass of oxygen} \\x & = & 28.0 + 224.0\\& = & \textbf{252.0 g}\\\end{array}\\\text{The mass of water was $\boxed{\textbf{252.0 g}}$}[/tex]

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