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Tems11 [23]
2 years ago
15

What is the percent of Li in Li3N ? Please!!

Chemistry
2 answers:
lisabon 2012 [21]2 years ago
6 0
I think it maybe 59.7852%
rjkz [21]2 years ago
3 0

Answer: Li percentage in Li_3N is 59.8%.

Explanation: The question asks to calculate the mass percentage of Li in Li_3N .

The formula used for mass percentage of an element in a compound is:

mass percentage = (\frac{element mass}{compound mass})*100

Atomic mass of Li is 6.94 and atomic mass of N is 14.0.

There are three Li in the given compound. So, the mass of Li in the compound is = 3(6.94) = 20.82

Mass of compound = 20.82 + 14.0 = 34.82

Mass percentage of Li = (\frac{20.82}{34.82})*100  = 59.8%

Hence, the percentage of Li in Li_3N is 59.8%.

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If irons temperature goes from 50c to 75c in a 20g sample, how many joules of heat were used?
Marina CMI [18]

Answer:

Option D. 230 J

Explanation:

We'll begin by calculating the temperature change of the iron. This can be obtained as follow:

Initial temperature (T₁) = 50 °C

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ΔT = T₂ – T₁

ΔT = 75 – 50

ΔT = 25 °C

Thus, the temperature change of the iron is 25 °C.

Finally, we shall determine the amount of heat energy used. This can be obtained as follow:

Mass (M) = 20 g

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Heat (Q) =?

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Q = 20 × 0.46 × 25

Q = 230 J

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3 years ago
How does sound wave travel through air
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3 years ago
g modenr vacuum pumps make it easy to attain pressures of the order of in the laboratory. at a preasusure of 6.75 atm and an ord
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Answer:

Number of molecules = 1.8267×10^20

Explanation:

From the question, we can deuced that the gases behave ideally, the we can make use of the ideal gas equation, which is expressed below;

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P =pressure

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T is the absolute temperature

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7 0
3 years ago
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