What is the gram formula mass of $KMnO_4$ ?

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Answer 1 · 2016-12-16T19:29:29

What's $(39.1+54.9..............)*g*mol^-1$

$(39.1+54.9+4xx15.999)*g*mol^-1=??*g*mol^-1.$

From where am I getting these numbers?

What is the gram formula mass of KMnO_4KMnO_4?