How many moles of ZnCl2 will be produced from 61.0 g of Zn, assuming HCl is excess?

0.938 moles of will be produced.

Explanation:

To calculate the moles, we use the equation:

moles of zinc:

As HCl  is in excess , zinc is the limiting reagent and it limits the formation of product.

According to stoichiometry :

1 mole of Zn produce =  1 mole of

Thus moles of  Zn produce = moles of

Thus 0.938 moles of will be produced.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.