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Julli [10]
2 years ago
6

A pure Silicon crystal has 700,000 free electrons (actual number of electrons; not the concentration). How many holes does it ha

ve
Chemistry
1 answer:
Sveta_85 [38]2 years ago
3 0

Answer:

700,000 holes

Explanation:

When heat energy occurs to produce free electrons, the number of free electrons produced is directly proportional and equal to the number of holes it produces at that time.

Hence, if silicon crystal (pure) has 700,000 free electrons, then the number of holes it have is also 700,000.

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Aluminum is malleabe
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The diagram shows Niels Bohr’s model of an atom.
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Answer:

Energy is absorbed, and an emission line is produced.

Explanation:

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A welding torch produces a flame by burning acetylene fuel in the presence of oxygen the energy released from the acetylene fuel
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Ammonium phosphate ((NH4)3 PO4) is an important ingredient to many fertilizers. It can be made by reacting phosphoric acid (H3 P
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Answer:

15.35 g of (NH₄)₃PO₄

Explanation:

First we need to look at the chemical reaction:

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Now we calculate the number of moles of ammonia (NH₃):

number of moles = mass / molecular wight

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Now from the chemical reaction we devise the following reasoning:

if         3 moles of NH₃ are produce 1 mole of (NH₄)₃PO₄

then   0.308 moles of NH₃ are produce X moles of (NH₄)₃PO₄

X = (0.308 × 1) / 3 = 0.103 moles of (NH₄)₃PO₄

mass = number of moles × molecular wight

mass = 0.103 × 149 = 15.35 g of (NH₄)₃PO₄

4 0
3 years ago
This is my first question on Brainly, Can someone explain Molar mass to me? I am not very good with it..
suter [353]
Hey,
A mole is a unit of measure that helps us compare particles of any given substance and its mass. ... The molar mass, also known as molecular weight, is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule. The unit used to measure is grams per mole.
5 0
3 years ago
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