Question

CAN SOMEONE PLEASE HELP ME WITH THIS QUESTION

Wrong or inproper answer will be reported

Answer 1

The mass of unreacted zinc = 13 g

Further explanation

The reaction equation is the chemical formula of reactants and products

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reactants and products

Reaction

`\tt Zn+2HCl\Rightarrow ZnCl_2+H_2`

mol ratio Zn : HCl = 1 : 2

• mol of HCl

`\tt mol=V* M\\\\mol=0.1~L(100~cm^3)* 2~mol/L\\\\mol=0.2`

• mol of Zn

`\tt (1)/(2)* 0.2=0.1~mol`

• the mass of reacted Zn :

`\tt 0.1* 65=6.5~g`

• the mass of unreacted Zn

`\tt 19.5-6.5=\boxed{\bold{13~g}}`