**What is the number of hydrogen atoms**

**What is the number of hydrogen atoms**

#### What is the number of hydrogen atoms, glucose molecules, and moles of glucose in a sample of glucose?

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The sample of glucose C6H12O6 contains 1.280×1021 carbon atoms. How can I determine the mass of this sample in grams? Thanks for your help.

Each molecule of glucose contains two atoms of hydrogen per one atom of carbon. so the sample contains 2*1.25*1021 = 2.5*1021 atoms of hydrogen

6 atoms of carbon = 1molecule of glucose

1.280*1021 atoms of carbon = X molecules

so the sample contains X = 1.280*1021/6 = 0.208*1021 molecules of glucose

1 mole of glucose =6.022*1023 molecules

n moles of glucose = 0.208*1021 molecules

so, the sample contains n = 0.208*1021/6.022*1023 =3.45*104 moles of glucose

m = M*n where M is the molar mass of glucose (180g/mol), n -moles

so the mass of sample, m = 180*3.45*104 = 0.62g

Each molecule of glucose contains two atoms of hydrogen per one atom of carbon. so the sample contains 2*1.25*1021 = 2.5*1021 atoms of hydrogen

6 atoms of carbon = 1molecule of glucose

1.280*1021 atoms of carbon = X molecules

so the sample contains X = 1.280*1021/6 = 0.208*1021 molecules of glucose

1 mole of glucose =6.022*1023 molecules

n moles of glucose = 0.208*1021 molecules

so, the sample contains n = 0.208*1021/6.022*1023 =3.45*104 moles of glucose

m = M*n where M is the molar mass of glucose (180g/mol), n -moles

so the mass of sample, m = 180*3.45*104 = 0.62g