**Answer:**

<h2>2.709 × 10²⁴ molecules</h2>

**Explanation:**

The number of molecules can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 4.5 × 6.02 × 10²³

We have the final answer as

<h3>2.709 × 10²⁴ molecules</h3>

Hope this helps you

Mercury atoms have 80 electrons and 80 protons with 122 neutrons in the most abundant isotope. Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temper

**Answer : The pressure of the hydrogen gas exert before its volume was decreased will be, 2.28 atm**

**Explanation :**

**According to the Boyle's law, **the pressure of the gas is inversely proportional to the volume of the gas at constant temperature of the gas and the number of moles of gas.

or,

or,

where,

= initial pressure of the gas = ?

= final pressure of the gas = 5.09 atm

= initial volume of the gas = 12.16 L

= final volume of the gas = 5.45 L

**Now put all the given values in this formula, we get the initial pressure of the gas.**

**Therefore, the pressure of the hydrogen gas exert before its volume was decreased will be, 2.28 atm**

**Answer:**

A or C

really i think it is both can you pick more than one or no

anything that turns red litmus paper to blue it is an acid and vice versa is true