can someone help me with this worksheet? specifically 2c http://assets.openstudy.com/updates/attachments/54ab2e16e4b0b83d9dca50af-hopienoelle-1420504635700-stoichiometry_worksheet_for_gizmo.pdf

Question

anonymous · Answer

plus im not exactly sure what to put in the table???idk im confused and my teacher hasn't helped at all

aaronq · Answer

Mass is given, the molar mass of atoms (e.g Au) you can find from the periodic table.

For $C_{12}H_{22}O_{12}$ you'll have to multiply the molar mass of each element by the number of each atom then add them together. That is:

Molar mass of $C_{12}H_{22}O_{12}$= 12*molar mass of C+22*molar mass of H+12*molar mass of O

Next, moles are found by dividing the mass by the molar mass:  

       $\sf moles=\dfrac{mass}{molar~mass}$

then atoms (units) found by multiplying the moles by avogadro's number:

       $\sf  units=moles*avogadro's ~number$

For $C_{12}H_{22}O_{12}$, the number of "units" is actually "molecules", so multiply the number of "molecules" by the number of atoms present in the formula (e.g. 12 carbons)