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monitta
3 years ago
5

What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%

Chemistry
1 answer:
Step2247 [10]3 years ago
4 0

Answer:

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

<em>Mass Cu:</em>

7.3g * 86% = 6.278g is the mass of Cu.

<em>Moles Cu:</em>

6.278g * (1mol / 63.546g) = 0.099moles Cu

<em>Atoms Cu:</em>

0.099moles Cu * (6.022x10²³atoms / 1mol) =

<h3>5.9x10²² atoms of Cu are in one naira coin</h3>
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The diagram above represents a reflex arc in a human. This pathway responds when someone touches something that causes pain, suc
Vinil7 [7]

Answer:

C) Integumentary, nervous, muscular

Explanation:

When a human body touches a hot stove , our sense organ which is integumen first of all receives the impulse of heat . The impulse is transformed into electrical signal which is transmitted to brain which is a part of nervous system . Then brain processes it and command signal is sent to muscle of hand to move it away from that place . Hence the order is

Integumentary, nervous, muscular .

4 0
4 years ago
Use the formula F = (9/5)C + 32 to convert 35 degrees Celsius to Fahrenheit.<br><br> Show your work.
torisob [31]

Answer:

95 °F

Explanation:

F=\frac{9}{5} C + 32 \\  plug \: C = 35  \: in \: above \: equation\\  \\ F=\frac{9}{ \cancel5}  \times \cancel {35 } \:   \purple{\bold{ \: 7}}+ 32 \\F=9 \times 7 + 32 \\ F=63 + 32 \\ F=95

4 0
3 years ago
0.5 moles of any gas is at STP, it will occupy how many LITERS of volume?
never [62]

Answer: 500L

Explanation:

No of moles= volume× molarity/1000

No of moles =0.5moles

Volume=?

Molarity of a gas at stp = 1M

Stp means standard temperature and pressure

No of moles = volume ×molarity/1000

Substitute the values

0.5=volume×1/1000

Cross multiply

Volume = 1000×0.5

Volume = 500L

The volume is 500L

5 0
3 years ago
What is the pressure of 0.5 mol of nitrogen gas in a 5 L container at 203 K
Ivan

Answer:

1.67 atm.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 5.0 L).

n is the no. of moles of the gas in mol (n = 0.5 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 203 K).

∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(203 K)/(5.0 L) = 1.67 atm.

3 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
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