Sterling silver contains 92.5% silver and 7.5% copper. A sterling silver dish weighs 185.0 g. What mass of copper is in the dish
2 answers:
<u>Answer:</u> The mass of copper in the dish is 13.875 grams.
<u>Explanation:</u>
We are given:
(m/m) % of copper = 7.5 %
This means that 7.5 grams of copper are present in 100 grams of solution.
We need to find the mass of copper in 185 grams of sterling silver dish.
To calculate the mass of copper, we use unitary method, we get:
In 100 g of sterling silver dish, the mass of copper is 7.5 grams.
So, in 185 grams of sterling silver dish, the mass of copper is =
Hence, the mass of copper in the dish is 13.875 grams.
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Given mass of Scandium = 50.0 g
Increase in temperature of the metal when heated =
Heat absorbed by Scandium =
The equation showing the relationship between heat, mass, specific heat and temperature change:
Where Q is heat =
m is mass = 50.0 g
ΔT =
On plugging in the values and solving for C(specific heat) we get,
=50.0g(C)(
)
C = 0.491
Specific heat of the metal = 0.491
Answer:
the concentration of bicarbonate is <em>[HCO₃⁻] = 0,03996 M </em>and carbonate is <em>[CO₃²⁻] = 3,56x10⁻⁵ M.</em>
Explanation:
Carbonate-bicarbonate is:
HCO₃⁻ ⇄ CO₃²⁻ + H⁺ With pka = 10,25
Using Henderson-Hasselbalach formula:
pH = pka + log₁₀
7,2 = 10,25 + log₁₀
8,91x10⁻⁴ = <em>(1)</em>
Also:
0,040 M = [CO₃²⁻] + [HCO₃⁻] <em>(2)</em>
Replacing (2) in 1:
<em>[HCO₃⁻] = 0,03996 M</em>
Thus:
<em>[CO₃²⁻] = 3,56x10⁻⁵ M</em>
I hope it helps.