Question

utilizando 148 g de hidroxidovde calcio Ca(OH)2 qual a massa obtida de CaCl2
2HCl + Cá(OH)2 → CaCl2 + 2H2O

Answer 1

Massas molares:

Ca(OH)2 = 74 g/mol
CaCl2 = 111 g/mol

Equação química balanceada:

2 HCl + Ca(OH)2 = CaCl2 + 2 H2O

74 g Ca(OH)2 ----------- 111 g CaCl2
148 g Ca(OH)2 ---------- x g 

x = 148 . 111 / 74

x = 16428 / 74

x = 222 g de CaCl2

espero ter ajudado!

Answer 2

$\rm{2HC\ell+Ca(OH)_2\Longrightarrow CaC\ell_2+2H_2O}\\\sf{c\acute{a}lculo~das~massas~molares:}\\\sf{Ca(OH)_2=40+2\cdot(16+1)=74g/mo\ell}\\\sf{CaC\ell_2=40+2\cdot35,5=111g/mo\ell}\\\sf{74\Longrightarrow 111}\\\sf{148\Longrightarrow x}\\\sf{74\cdot x=148\cdot111}\\\sf{x=\dfrac{\diagdown\!\!\!\!\!\!148^2\cdot111}{\diagdown\!\!\!\!\!74}}\\\huge\boxed{\boxed{\boxed{\boxed{\boxed{\tt{x=222~g~de~CaC\ell_2}}}}}}$