Answer:
115 g/mol
Explanation:
Step 1: Given data
- Initial mass of the earring (mi): 1.41 g
- Final mass of the earring (mf): 3.952 g
- Moles of the unknown metal deposited (n): 0.022 mol
Step 2: Calculate the mass of the unknown metal deposited
An earring is plated in an electrolytic cell. The mass of the unknown metal deposited can be calculated using the following expression.
<em>m = mf - mi</em>
m = 3.953 g - 1.41 g
m = 2.54 g
Step 3: Calculate the molar mass (M) of the unknown metal
0.022 moles of the metal have a mass of 2.54 g. The molar mass of the metal is:
<em>M = m/n</em>
M = 2.54 g / 0.022 mol
M = 115 g/mol
Answer:
Heterogeneous
Explanation:
The catalyst, Pt, is not in the same phase as the reactants, i.e. it is solid, whilst the hydrogen peroxide is aqueous.
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