\(m_{Ba\left(NO_3\right)_2}=\dfrac{200.5}{100}=10g\\ m_{H_2O}=200-10=190g\)
\(m_{Ba\left(NO_3\right)_2}=\dfrac{5\%.200}{100}=10\left(g\right)\)
\(m_{H_2O}=200-10=190\left(g\right)\)
\(m_{Ba\left(NO_3\right)_2}=\dfrac{5.200}{100}=10\left(g\right)\\ m_{H_2O}=200-10=190\left(g\right)\)