The atomic radius of a chemical element is a measure of the size of its atom.
The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.
The atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.
You cannot find it if you do not know the information. Was there a molar mass given or do you know if it is asking for the molar mass?
The empirical formula :
MgCl₂
Li₂O
<h3>Further explanation</h3>
Given
a 3.60 g of magnesium and 10.65 g of chlorine
b 9.1 g of lithium and 10.4 g of oxygen
Required
The empirical formula
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
a. mol ratio of Mg (Ar=24 g/mol) and Cl(Ar=35.5 g/mol)
Mg : Cl
=3.6/24 : 10.65/35.5
=0.15 : 0.3 = <em>divide by 0.15</em>
=1 : 2
The empirical formula : MgCl₂
b. a. mol ratio of Li (Ar=7 g/mol) and O(Ar=16 g/mol)
Li : O
=9.1/7 : 10.4/16
=1.3 : 0.65 = <em>divide by 0.65</em>
= 2 : 1<em> </em>
The empirical formula : Li₂O
Answer:
Yield of reaction is 76.7%
Explanation:
The reaction of salicylic acid with acetic anhydride to produce acetyl salicylic acid is 1:1. That means 1 mole of salicylic acid reacts with 1 mole of acetic anhydride (Acid is catalyst of reaction).
Moles of salicylic acid are:
And moles of acetic anhydride are:
As salicylic acid is limiting reactant, theoretical moles of acetyl salicylic acid are 0.04127mol. That means theoretical mass of acetyl salicylic acid is:
Thus, yield of reaction is:
<em>76.7%</em>