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What is the mass of 2.90 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
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What is the mass of 2.90 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?

User TooTone
by
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40.0 g -----------> 6.02x10²³ molecules
?? ---------------> 2.90x10²² molécules

mass = 2.90x10²² * 40.0 / 6.02x10²³

mass = 1.16x10²⁴ / 6.02x10²³

mass = 1.9269 g

hope this helps!
User Xavier Noria
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