Calculate the mass of ZnCl formed when 30g of Zn is reacted according to the following equation:
___ Zn + ___ HCl ___ ZnCl + ___H 2

62.7g ZnCl2

Explanation:

Zn+ 2HCl = ZnCl2 + H2

Atomic mass of Zn is 65

Atomic mass of Cl is 35.5

Atomic mass of H is 1

Molecular mass of ZnCl2 is {65+(35.5×2)}= 136

So,

65g of Zn produce 136g of ZnCl2

1g ofZn produce( 136÷65)gZnCl2

= 2. 09g

30g ofZn produce (2. 09×30)

=62.7g ZnCl2

the mass of ZnCl2 is 62.7g when 30g of Zn is reacted .

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vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.