How do you calculate the molar mass of each of the following compounds?

Question

#Cu(OH)2#
#MgO#
#Mg(NO_3)_2#
#NaCl#
#(NH_4)_2SO_4#
#H_2SO_4#
#Ca_3(PO_4)_2#
#NH_4NO_3#

Jeremiah Adams · Accepted Answer

I will answer one, and from the answer you can use the same method tom work out the rest: #Ca_3(PO_4)_2# = 310.177 g/mol

You need to look up the atomic weight of each element (these can be found by asking google for the atomic weights): #Ca_3# means there are three Ca; #PO_4# means there is one P and 4 oxygen, the #()_2# means there two #PO_4#. So, substituting in the values: #Ca_3(PO_4)_2# (3 x 40.078) + ((30.973762 + (4 x 15.9994)) x 2) 120.234 + ((30.973762 + 63.9976) x 2) 120.234 + (94.971362 x 2) 120.234 + 189.942724 310.177 So the answer is 310.177 g/mol You should now be able to use the above approach to work out the answers for the other compounds.

Mateo Aguilar · Answer

Simply add the molar masses of the individual elements.

For calcium phosphate, #Ca_3(PO_4)_2# we do the sum: #{3xx40.08 (Ca),+2xx31.00 (P), +8xx16.00 (O)}*g*mol^-1# #=# # 310.18*g·mol^-1#. If we had lithium phosphate, #Li_3PO_4#, what would be the formula mass? I invite you to do the rest of the salts on your list. You will need a Periodic Table to get the individual molar masses of the elements.

Naomi Aronson · Answer

undefined To calculate the molar mass of a compound, you add up the atomic masses of all the atoms present in the compound, taking into account the number of each type of atom according to the chemical formula.

How do you calculate the molar mass of each of the following compounds?

#Cu(OH)2# #MgO# #Mg(NO_3)_2# #NaCl# #(NH_4)_2SO_4# #H_2SO_4# #Ca_3(PO_4)_2# #NH_4NO_3#

#Cu(OH)2#
#MgO#
#Mg(NO_3)_2#
#NaCl#
#(NH_4)_2SO_4#
#H_2SO_4#
#Ca_3(PO_4)_2#
#NH_4NO_3#