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3 years ago

If an element has 12 protons and 17 neutrons, how many electrons must it have?

Chemistry

2 answers:

kati45 [8]3 years ago

8 0

Number of electrons = Number of Protons

So, Number of electrons will be 12

ad-work [718]3 years ago

3 0

The elements are electrically neutral, this is they have the same amount of positive as negative charge.

Electrons and protons have each the same amount of charge but different sign. Eletrons are negative and protons are positive.

Then to be neutral, the number of electrons must be equal to the number of protons. This mean that the element must have 12 electrons.

Answer: 12.

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The partial pressure of N2 in the air is 593 mm Hg at 1 atm. What is the partial pressure of N2 in a bubble of air a scuba diver

Evgen [1.6K]

Answer: Partial pressure of $N_{2}$ at a depth of 132 ft below sea level is 2964 mm Hg.

Explanation:

It is known that 1 atm = 760 mm Hg.

Also, $P_{N_{2}} = x_{N_{2}}P$

where, $P_{N_{2}}$ = partial pressure of $N_{2}$

P = atmospheric pressure

$x_{N_{2}}$ = mole fraction of $N_{2}$

Putting the given values into the above formula as follows.

$P_{N_{2}} = x_{N_{2}}P$

$593 mm Hg = x_{N_{2}} \times 760 mm Hg$

$x_{N_{2}}$ = 0.780

Now, at a depth of 132 ft below the surface of the water where pressure is 5.0 atm. So, partial pressure of $N_{2}$ is as follows.

$P_{N_{2}} = x_{N_{2}}P$

= $0.78 \times 5 atm \times \frac{760 mm Hg}{1 atm}$

= 2964 mm Hg

Therefore, we can conclude that partial pressure of $N_{2}$ at a depth of 132 ft below sea level is 2964 mm Hg.

8 0

3 years ago

Refer to the example about diatomic gases A and B in the text to do problems 19 - 27.

soldier1979 [14.2K]

Answer:a

Explanation:

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3 years ago

Bacteria that can make food using chemicals are called

Naddik [55]

False because I think it’s supposed to be photoheteroterotrophs

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3 years ago

In an ideal gas, collisions between molecules ________.

marta [7]

Answer:

D. All of the Above

Explanation:

4 0

3 years ago

< Progress: 19/21 groups Due Jan 15 at 11:55 PM Use the References to access important values if needed for this question. Th

Ierofanga [76]

Answer:

CoSO4.7H2O

Cobalt II tetraoxosulphate VI heptahydrate

Explanation:

According to IUPAC nomenclature, compounds are named systematically.

We were told that there are seven water molecules in each formula unit Hence the correct formula of the compound is CoSO4.7H2O

According to IUPAC system, the metal is first named, followed by its oxidation state in Roman numerals. Then the name of the anion is mentioned as well as the number of water molecules. We have to take into account the correct prefix signifying the number of molecules of water of crystallization.

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3 years ago