Caculate the number if moles of the following: 800. g of ca

Mole   is  equal  to   mass  of  the  element  divided  by   molar  mass  of  the  element.  that   is
mole=mass/molar  mass
From  periodic  table calcium  has  a   molar  mass  of  40   g/mol
moles  is   therefore  =800g/40g/mol=20moles

Because a model would make the investigation easier to understand

What do you need with it’s not a question your just stating what it says