Consider an iron bar on a balance as shown.
As the iron bar rusts, which of the following is true? Explain your answer.
a. The balance will read less than 75.0 g.
b. The balance will read 75.0 g.
c. The balance will read greater than 75.0 g.
d. The balance will read greater than 75.0 g, but if the bar is removed, the rust is scraped off, and the bar replaced, the balance will read 75.0 g.
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