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sergij07 [2.7K]
3 years ago
10

How many neutrons does element X have if its atomic number is 32 and its mass number is 75?

Chemistry
1 answer:
BabaBlast [244]3 years ago
5 0

i think the answer is 43

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How many grams of solid Ca(OH)2 (74.1 g/mol) are required to make 500 ml of a 3 M solution?
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111.15 g are required to prepare 500 ml of a 3 M solution

Explanation:

In a 3 M solution of Ca(OH)₂ there are 3 moles of Ca(OH)₂ per liter solution. In 500 ml of this solution, there will be (3 mol/2) 1.5 mol Ca(OH)₂.

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(1.5 mol Ca(OH)₂ *(74.1 g / 1 mol)) 111.15 g. This mass of Ca(OH)₂ is required to prepare the 500 ml 3 M solution.

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3 years ago
A reaction is non-spontaneous at any temperature when
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Answer:

A reaction is non-spontaneous at any temperature when the Gibbs free energy > 0.

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ΔG = Gibbs free energy

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The formula is: ΔG = ΔH - T.ΔS

ΔH → Enthalpy → Energy gained or realeased as heat.

ΔH < 0 → <em>Exothermic reaction. Spontaneity is favored </em>

T  → Temperature

ΔS → Entropy →  Degree of disorder of a system.

When the system has a considered disorder ΔS > 0, disorder increases.

When the system is more ordered, ΔS < 0, disorder decreases.

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If the frequency 38 Hz and the wavelength 20m what is the wave speed in Science
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