Chemistry, 24.08.2019 13:30 gacyber

Can someone explain me why the molar mass become 90.12 g/mol and when i calculated it's 90 g/mol?

Can someone explain me why the molar mass become 90.12 g/mol and when i calculated it's 90 g/mol? <

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Can someone explain me why the molar mass become 90.12 g/mol and when i calculated it's 90 g/mol?