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4 years ago

How many valence electrons are in a silicon atom?

Chemistry

1 answer:

vladimir1956 [14]4 years ago

4 0

Four valence electron

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Please help with these two chemistry questions. Image attached.

mars1129 [50]

The answers for the following questions is answered below.

Therefore the volume of a gas is 22.4 L

Therefore the number of moles of oxygen are 2.37 moles

Explanation:

1. Given:

no of molecules (n) = 6.023 × $10^{23}$

volume of gas at STP conditions (V) =22.4 liters

To solve:

Volume of gas (v)

We know;

$\frac{n}{N_{a} } =\frac{v}{V}$

$\frac{6.023 * 10^{23} }{6.023 * 10^{23} } =\frac{v}{22.4}$

1 × 22.4 = v

v =22.4 L

Therefore the volume of a gas is 22.4 L

2. Given:

volume of oxygen gas (v) = 53 L

Volume of gas at STP conditions (V) =22.4 L

To solve:

no of moles of oxygen gas

We know;

$n =\frac{v}{V}$

n = $\frac{53}{22.4}$

n =2.37 moles

Therefore the number of moles of oxygen are 2.37 moles

6 0

3 years ago

Suppose you made 40 atoms of Highlinium and it has a

Karo-lina-s [1.5K]

Answer:

After 6sec 5 atoms will be left.

Explanation:

Given data:

Total atoms of Highlinium = 40

Half life = 2 sec

Atoms left after 6sec = ?

Solution:

First of all we will calculate the number of half lives passes during 6sec.

Number of half lives = Time elapsed/ half life

Number of half lives = 6 sec / 2sec

Number of half lives = 3

Now we will calculate the number of atoms left

At time zero = 40 atoms

At 1st half life = 40 atoms/2 = 20 atoms

At 2nd half life = 20 atoms/2 = 10 atoms

At 3rd half life = 10 atoms / 2 = 5 atoms

Thus, after 6sec 5 atoms will be left.

6 0

3 years ago