a sample of sodium hydroxide contain 2.5 ×10^10 molecules. what is the mass of this sample?
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Worked Example: mass = moles × molar mass (m=n×M)
Extract the data from the question: moles = n = 0.25 mol. ...
Check the data for consistency: ...
Write the mathematical equation (mathematical formula): mass = moles × molar mass. ...
Substitute the values into the equation and solve for mass (g): mass = m = 0.25 × 18.016 = 4.504 g.
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