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2 years ago

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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Answer:

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$\frac{d[SO_{3}] }{dt} = 2 [-\frac{d[O_{2}] }{dt} ]$

⇒ $\frac{d[SO_{3}] }{dt}$ = 2 x 3.64 x 10⁻³ M/s

⇒ $[\frac{d[SO_{3}] }{dt}]$ = 7.28 x 10⁻³ M/s

∴ So the rate of formation of SO₃ $[\frac{d[SO_{3}] }{dt}]$ = 7.28 x 10⁻³ M/s

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Hoped this helped in any way

Have a nice day

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