It’s the 3d one
Good luckkkkkkkk
Answer:
<em><u>≅ 50, 909 nm</u></em>
Explanation:
Wavelength, λ = 
Given:
speed of light = 
f = 5.89 × 
∴ λ = 3×
/ 5.89 × 
= 0.0000509 m <em><u>≅ 50, 909 nm</u></em>
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<em>Let me know if you need further assistance</em>
From the coefficients of the equation, we see that for every 4 moles of aluminum consumed, 3 moles of oxygen are consumed.
So, the answer is (12/4)(3) = 9 moles.