How many grams of ammonium sulphate (NH4)2Cl are there in 400cm cubed of a solution which has a concentration of 0.05mol dm^-3?

(N=14 O=16 H=1 CI = 35.5)

I got CxV/1000 = 0.05 x 400/1000=0.02

0.02x RMM

0.02 x 71.5 = 1.43grams?

Is this correct?
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