What is the molar mass of #H_2CO_3#?
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"Which following pairs of atoms, have a lower electron affinity? a) Ca,K b) I,F c) Li, Ra. I seriously don't know anything about electron affinity all ik that it can buy another element"
To find molar mass, multiply the molar mass of each atom by the number of that type of atom and then add the masses. I have done it in detail here showing units.
The molar mass is the mass in grams of 1 mol of a substance. #H_2CO_3# has 2 atoms of H, 1 atom of C, and 3 atoms of O. So 1 mole of it has 2 mol H, 1 mol C, and 3 mol O. The mass of one mole of an atom is the molar mass in #g/(mol)# on the periodic table. So the molar mass is:
#2# #mol# #H* (1.01\ g\ H)/(mol\ H_2CO_3)= (2.02\ g\ H)/(mol\ H_2CO_3)#
#1# #mol# #C* (12.01\ g\ C)/(mol\ H_2CO_3)= (12.01\ g\ C)/(mol\ H_2CO_3)#
#3# #mol# #O* (16.00\ g\ O)/(mol\ H_2CO_3)= (48.00\ g\ O)/(mol\ H_2CO_3)#
#(2.02\ g\ H)/(mol\ H_2CO_3)+(12.01\ g\ C)/(mol\ H_2CO_3)+(48.00\ g\ O)/(mol\ H_2CO_3)=(62.03\ g\ H_2CO_3)/(mol\ H_2CO_3)#
