what is the mass of 0.05 moles of na2S2O3 5H2O
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no. of moles = mass given in gram / gram mol. mass
here no . of moles is = 0.05
gram mol. mass of Na2S203=
248 g/mol and let mass is =x
put all values in formula ,
0.05 = x / 248
x = 0.05 x 248
x = 12 .4 g
the value of mass is 12.4 g
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