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Amanda [17]
3 years ago
10

2. How many moles of copper are needed to react with sulfur to produce 0.25 moles of

Chemistry
1 answer:
dimaraw [331]3 years ago
6 0

Answer:

0.5

Explanation:

Cu       Cu2S

2   :       1 ratio

therefore  0.25 moles of Cu2S * (2 moles of Cu/ 1 mole of Cu2S)

=0.5 moles of Cu

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A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
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Answer:

The frequency of photon is 0.75×10¹⁵ s⁻¹.

Explanation:

Given data:

Energy of photon = 5×10⁻¹⁹ J

Frequency of photon = ?

Solution:

Formula;

E = hf

h = planck's constant = 6.63×10⁻³⁴ Js

5×10⁻¹⁹ J =  6.63×10⁻³⁴ Js ×f

f =  5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js

f = 0.75×10¹⁵ s⁻¹

The frequency of photon is 0.75×10¹⁵ s⁻¹.

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Wich describes an object in projectile motion?
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A rock has a mass of 48 grams and a volume of 16 mL. What is the density of the rock?
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