Answer:
1) HCl reagent was added in excess
Explanation:
The equation of the reaction is given as;
Zn + HCl --> ZnCl2 + H2
From the stoichiometry;
1 mol of Zn reacts with 1 mol of HCl
In 2g of Zn;
mass = 2
Molar mass = 65.38g/mol
Number of moles = Mass/ Molar mass = 2 / 65.38 = 0.03059 mol
In 10ml of HCl;
the number of moles is: moles = Concentration * Volume = (10 moles/L) (0.0100 L) = 0.10 moles
Comparing 0.03059 mol of Zn : 0.10 mol of HC with the stochiometry, we can deduce that HCl is by far greater. Hence the correct option is option 1.
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Answer:
The answer to your question is 5.019 x 10²² atoms
Explanation:
Data
mass of ammonium carbonate = 8 g
number of atoms = ?
Process
1.- Calculate the molar mass of (NH₄)₂CO₃
(NH₄)₂CO₃ = (14 x 2) + (1 x 8) + (12 x 1) + (16 x 3)
= 28 + 8 + 12 + 48
= 96 g
2.- Calculate the number of atoms
96 g ------------------ 6.023 x 10²³ atoms
8 g ----------------- x
x = (8 x 6.023 x 10²³) / 96
x = 5.019 x 10²² atoms
Answer:
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