3 years ago

Which of these describes “Al”?

Chemistry

2 answers:

Leya [2.2K]3 years ago

4 0

Explanation:

Aluminium is Al on the periodic table.

But is this the complete question

BigorU [14]3 years ago

3 0

Answer:

aluminium

Explanation:

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A laser is emitting photons with a wavelength of 639.8 nm. What is the energy for 1 mole of these photons? For Planck's constant

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The energy for 1 mole of these photons is E = 31 × $10^{-23}$ $\frac{KJ}{mol}$

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Given data

Wavelength $\lambda =$ 639.8 × $10^{-9}$ m

Plank constant h = 6.626 × $10^{-34}$ J sec

Speed of light c = 3 × $10^{8}$ meter per second

We know that Energy of a photon is given by

$E = \frac{h c}{\lambda}$

Value of ( h c ) = 6.626 × $10^{-34}$ × 3 × $10^{8}$ = 19.878 × $10^{-26}$

$\lambda =$ 639.8 × $10^{-9}$ m

Now Energy of a photon

$E =( \frac{19.878}{639.8}) 10^{-17}$

E = 0.031 × $10^{-17}$ Joule per mole

E = 31 × $10^{-23}$ $\frac{KJ}{mol}$

Therefore the energy for 1 mole of these photons is E = 31 × $10^{-23}$ $\frac{KJ}{mol}$

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4 years ago