How many atoms are in one mole of gold? A) 1.97 x 1023 atoms. B) 6.02 x 1023 atoms C) 79 atoms. D) 197 atoms

Chemistry

2 answers:

Hatshy [7]3 years ago

8 0

Answer: B) $6.022\times10^{23}$ atoms.

Explanation:

According to the International System of units ,

A mole is basically denotes a unit that contains $6.022\times10^{23}$ of atoms.

It is also known as Avagadro Number.

Similarly, the number of atoms in one mole of gold = $6.022\times10^{23}$

hence, the correct answer is B) $6.022\times10^{23}$ atoms.

Kobotan [32]3 years ago

3 0

B. Is the Answer 6.022 * 1023

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Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.

<h3>Enthalpy of a chemical reaction</h3>

The enthalpy of a chemical reaction is known as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

<h3>Heat released in this case</h3>

In this case, the balanced reaction is:

2 Mg(s) + O₂ (g) → 2 MgO(s) + 1204 kJ

This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 1204 kJ of heat is released.

When 0.75 moles of Mg are burned, then you can apply the following rule of three: if 2 moles of Mg releases 1204 kJ of heat, 0.75 moles of Mg releases how much heat?

$heat=\frac{0.75 moles of Mgx1204 kJ}{2 moles of Mg}$