\(m_{ddNaNO_3}=700.1,1429=800\left(g\right)\\ m_{NaNO_3}=800,03.20\%=160\left(g\right)\\ m_{H_2O}=800-160=640\left(g\right)\)
\(m_{ddNaNO_3\left(20\%\right)}=700.1,1429=698,9\left(gam\right)\)
\(n_{NaNO_3}=\dfrac{698,9.20\%}{83}=168,4\left(mol\right)\)
\(mNaNO_3=168,4.83=13978\left(gam\right)\)
\(m_{ddNaNO_3}=700.1,1429=800\left(g\right)\)
\(m_{NaNO_3}=800.20\%=160\left(g\right)\)
\(m_{H_2O}=800-640=160\left(g\right)\)
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