Question

Zn(s) + 2AgNO3(aq) 2Ag(s) + Zn(NO3 )2(aq) When 17.7 g of silver is produced, _____ g of zinc nitrate is also produced.

Answer 1

Zn(s) + 2AgNO3(aq) ----> 2Ag(s) + Zn(NO3 )2(aq)
Mass of silver is given as 17.7g
you can find molecular mass from periodic table
use formula mole= mass/molecular mass
put the values into the formula and get mole of Silver

now look at the ratio between Silver and Zinc nitrate
look at coefficients
coefficient before Silver is 2 and before Zinc nitrate is No number which means 1
thus ratio is 2:1
so 2 of Silver gives ----mole you just calculated
1 of Zinc nitrate -----X mole

X= (1* mole that you just got)/ 2
and the answer will be mole of Zinc nitrate


now you have mole of Zinc nitrate and you can find molecular mass from periodic table
thus use mole formula again
mole= mass/Molecular mass

this time find mass
so mass= mole* molecular mass
and get your final answer for mas of Zinc nitrate


hope it helps :)