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posted by Joy Saturday, January 5, 2013 at 8:10pm.

What is the mass of 1.75 x 10^24 molecules of NH3?

How many moles do you have? That's 1.75E24/6.02E23 = ? 1 mol NH3 has a mass of 17 g (14 +. 3*1 = 17)

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