PDF chapter test TRY NOW
1. Calculate the mass of \(1.51\times10^{23}\) molecules of water.
Data:
Given molecules of \(H_2O=1.51\times10^{23}\)
Molecular mass of \(H_2O=18\)
Avogadro's number \(=6.023\times10^{23}\)
Solution:
Number of moles \(=\)
Number of moles \(=\)
Mass \(=\)
2. Calculate the mass of \(5\times10^{23}\) molecules of glucose.
Data:
Given molecules of glucose \(=1.51\times10^{23}\)
Molecular mass of glucose \(=\)
Avogadro's number \(=6.023\times10^{23}\)
Formula:
Mass of glucose \(=\)
Where,
x \(=\)
y \(=\)
Hence, the mass of \(5\times10^{23}\) molecules of glucose \(=\)
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