4 Zn(s) + 10 HNO3(aq) ---------------- 4 Zn(NO3)2(aq) + NH4NO3(aq) + H2O(l)
4 mole 10 mole 1 mole
mass of HNO3 = 1.05 grams
molar mass of HNO3 = 63.0 gram/mole
number of moles of HNO3 = mass/molar mass = 1.05/63.0 = 0.0167 moles
one mole of an atom contains Avagadro number of atoms
Avagadro's number = 6.023x10^23
according to equation
10 moles of HNO3 = 4 moles of Zn
0.0167 moles of HNO3 =?
= 4x0.0167/10 = 0.00668 moles of Zn
number of moles of Zn reacts = 0.00668 moles
number of Zn atom present in 1 mole of Zn = 6.023x10^23 atoms
number of Zn atom present in 0.00668 moles of Zn = ?
= 0.00668 x 6.023x10^23= 0.040x10^23 atom
Number of Zn atoms = 4.0x10^21 atoms
b)
according to the equation
1 mole of NH4NO3 = 4 moles of Zn
molar mass of NH4NO3 = 80.04 gram/mole
molar mass of Zn= 65.38 gram/mole
according to equation
80.04 grams of NH4NO3 = 4x65.38 grams of Zn
28.3 grams of NH4NO3 = ?
= 4x65.38 x 28.3/80.04 = 92.47 grams
Mass of Zn = 92.47 grams.
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