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Answer 1 · 2017-03-01T01:17:37

The molar ratio of #"Cr"# to #"Cu"# is 1:1 = 1

The chemical equation is

#"Cr" + "CuSO"_4 → "CrSO"_4 + "Cu"#

The equation tells you that 1 mol of #"Cr"# produces 1 mol of #"Cu"#.

Therefore, the molar ratio is

#"Moles of Cr"/"Moles of Cu" = 1/1 =1#

The 1 is an integer, so it has an infinite number of significant figures.