3 years ago

What is the relationship between Avogadro's number and a mole?

Physics

1 answer:

Shtirlitz [24]3 years ago

8 0

Answer:

A. There are 6.02 x 1023 items in a mole, which equals Avogadro's

number

Explanation:

The mole of a substance is

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Answer:

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Explanation:

The electric force between two charges can be calculated using Coulomb's Law. According to this law the force between two point charges is given as:

$F=k\frac{q_{1} q_{2} }{r^{2}}$

where k is a proportionality constant known as the Coulomb's law constant. Its value is $9 \times 10^{9}$ Nm²/C²

r = distance between charges = 70 cm = 0.7 m

q1 = q2 = 4nC = $4 \times 10^{-9}$ C

The negative sign indicates that the charges are negative. In the formula we will only use the magnitude of the charges.

Using these values in the formula, we get:

$F=9 \times 10^{9} \times \frac{4 \times 10^{-9} \times 4 \times 10^{-9}}{0.7^{2}}\\\\ F=2.94\times10^{-7} N\\\\ F=29.4 \times 10^{-6} N\\\\ F=29.4 \mu N$

Therefore, the magnitude of repulsive force between the given charges will be 29.4 uN

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