How many moles of sodium chloride are present in #58*g# of the salt?

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Answer 1 · 2017-02-15T21:55:06

The molar mass of sodium chloride is in fact #58.44*g#.....

Molar mass of NaCl

#=# #"Atomic mass of sodium + atomic mass of chlorine"#

#=# #(22.99+35.45)*g*mol^-1.#

From where do you get these atomic masses?

The number of moles of sodium chloride in a mass of #58*g# sodium chloride is given by the quotient,

#"Mass"/"Molar mass"=(58*cancelg)/((22.99+35.45)*cancelg*mol^-1)# #=#

#"A tad under one mole."#

Note that this is dimensionally consistent in that #1/(mol^-1)=1/(1/(mol))=mol# as required.