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ElenaW [278]
3 years ago
5

The mass of copper obtained experimentally was 0.872 g. Calculate the percentage yield of

Chemistry
1 answer:
frozen [14]3 years ago
6 0

Answer:

% yield = (0.872 g Cu / 1.017 g ) x 100 = 85.74 %.

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Lighters are usually fueled by butane (c4h10). when 1 mole of butane burns at constant pressure, it produces 2658 kj of heat and
Leokris [45]

Answer:

ΔE = -2661 KJ/mole

ΔH = -2658 KJ/mole

Explanation:

ΔH = q - PΔV

ΔE = q + w

<u>First, to find ΔE:</u>

The reaction PRODUCES 2658 kJ of h (q), and does 3 kJ of work (w).

2658 kJ(q) + 3 kJ(w) = 2661 kJ, BUT the reaction <u><em>PRODUCES</em></u> heat, which means ΔE is negative.

ΔE = -2661 KJ/mole

<u>Second, to find ΔH:</u>

ΔH = q - PΔV

ΔH = 2658 kJ(q) - PΔV

Now, the question states that butane burns at a constant pressure; that just translates to the pressure of the reaction is equal to 0.

ΔH = 2658 KJ(q) - (0)ΔV

ΔH = 2658 KJ - 0

ΔH = 2658 kJ, BUT, like before, the reaction PRODUCES heat, which also mean ΔH is negative.

ΔH = -2658 KJ/mole

I hope this helped! Have a nice week.

5 0
3 years ago
The table below provides some information about an unidentified element. Based on this information, the unidentified element is
Leona [35]

In the physical properties, it is mentioned that the element has 4 valence electrons. The elements in the periodic table are arranged such that, the number of valence electrons present in the neutral atoms belonging to a particular group  is equal to the group number.

Thus, the unidentified element can be best classified as a nonmetal in period 4

Ans C)

5 0
3 years ago
there are several ways of producing electrical energy (coal,hydrpower,nuclear power,solar,wind,geothermal,etc.)but which way is
dlinn [17]
Well, that depends on cost, maintenance, and power output most of the time. Geothermal seems to be best because you could heat up water, and the heat from said water can be used to create electricity. Making it extremely eco-friendly, which makes it the best in that regard.
5 0
3 years ago
In Kevin’s favorite comic book, the superhero has special powers. In one adventure, the superhero must stop an evil villain who
KATRIN_1 [288]

Answer:

3

Explanation:

The law of conservation of energy states that energy cannot just be created, so answer one is out. Energy also cannot be simply destroyed, so answer to is out as well. From here it gets tricky, since both answers make some sense under these rules. However, absorbed is bassically the same as destroying it leaving only answer three. Answer three <em>does</em> obey these laws, as energy can be converted.

3 0
2 years ago
What makes up a film badge?
Inessa [10]

Film badges is a personal dosimeter used for monitoring cumulative radiation dose due to ionizing radiation.

A panel or layers of photographic film covered with black paper and exposed to air ,salt,and other chemicals on clear acetate

8 0
3 years ago
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