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The atomic mass of hydrogen is 1.008 u. The atomic mass of carbon is 12.011 u. There are 4 hydrogen atoms in methane. Add together the weight of all the atoms in methane to find the molecular weight.   1.008∗4=4.032u{\displaystyle 1.008*4=4.032u}. 12.011∗1=12.011u{\displaystyle 12.011*1=12.011u} 12.011+4.032=16.043u{\displaystyle 12.011+4.032=16.043u} The atomic mass of carbon is 12.011 u. The atomic mass of hydrogen is 1.008 u. The atomic mass of oxygen is 15.999 There are 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. Add up the mass of all of the atoms in glucose to calculate the molecular weight.  12.011∗6=72.066u{\displaystyle 12.011*6=72.066u} 1,008∗12=12.096u{\displaystyle 1,008*12=12.096u} 15.999∗6=95.994u{\displaystyle 15.999*6=95.994u} 72.066+12.096+95.994=180.156u{\displaystyle 72.066+12.096+95.994=180.156u}
Find the molecular weight of methane (CH4). Calculate the molecular weight of glucose (C6H12O6).