Answer:
16.74×10²³ atoms
Explanation:
Given data:
Number of moles of X = 2.78 mol
Number of atoms = ?
Solution:
According to Avogadro number.
1 mole of any substance contain 6.022×10²³ atoms. Thus,
2.78 mol × 6.022×10²³ atoms / 1 mol
16.74×10²³ atoms
The number 6.022 × 10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Answer:
Nitrogen
Explanation:
Because of its inert nature
Answer:
hurricanes form over warm oceans
Explanation:
because it can not form in hot nor cold oceans
<u>Answer:</u> The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.
<u>Explanation:</u>
We are given:
Amount of heat released = 1950 J = 1.950 kJ (Conversion factor: 1 kJ = 1000 J)
The chemical equation for the reaction of magnesium carbonate and hydrochloric acid follows:

By Stoichiometry of the reaction:
If 23.4 kJ of heat is released, then 1 mole of magnesium carbonate is dissolved
So, when 1.950 kJ of heat is released, then =
of magnesium carbonate is dissolved
To calculate the mass of the substance by given number of moles, we use the equation:
Moles of magnesium carbonate = 0.083 moles
Molar mass of magnesium carbonate = 84.3 g/mol
Putting values in above equation, we get:

Hence, the mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.