A sample of sodium chloride has a mass of 123.45g, how many particles does it have ?

Question

mertsj · Answer

Calculate the number of moles and then multiply by avagadro's number.

unklerhaukus · Answer

number of moles = mass / molar mass

n = m / M

unklerhaukus · Answer

the molar mass of sodium chloride equals the molar mass of sodium plus the molar mass of chlorine 

M_NaCl = M_Na + M_Cl

unklerhaukus · Answer

Avogadros number is about 6.02x10^23 [molecules/mole]

unklerhaukus · Answer

the molar masses of sodium and chlorine can be found on a periodic table

anonymous · Answer

i did that and the molar masses of them both is 58.44, but what do i do next do i divide it by the mass of 123.45 or do i use avogrado number ?

mertsj · Answer

Calculate the number of moles and then multiply by avagadro's number.

unklerhaukus · Answer

good 58.44 [grams/mole] is the  right molar mass of sodium chloride

mertsj · Answer

If it takes 58.44 grams to make one mole, how many moles is 123.45 grams?

mertsj · Answer

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