Question

hoa tan het 5.6gam CaO vao dung dich HCl 14.6%. khối lượng dung dich HCl đã dùng là?

Answer 1

PTHH: CaO + 2HCl -> CaCl₂ + H₂O

Ta có: \(n_{CaO}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ =>n_{HCl}=0,1.2=0,2\left(mol\right)\\ =>m_{HCl}=0,2.36,5=7,3\left(g\right)\\ =>m_{ddHCl}=\dfrac{100.7,3}{14,6}=50\left(g\right)\)

Answer 2