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For this you need the atomic (molecular) mass of NaCN. Take the number of grams and divide it by the Atomic Mass. Multiply by one mole for units to cancel. NaCN= 49.0 grams

2.55 grams NaCN / (49.0 grams) = .0520 moles NaCN

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Q: How many moles in 2.55 grams of sodium cyanide?
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