In a combustion reaction, one of the reactants is always oxygen.
Answer:
3grams
Explanation:
The reaction for the production of Magnesium dioxide will be
Mg + O2 → MgO
we have 5g of MgO (molar mass 40g)
no of moles of MgO = 5/40 = 0.125
Using unitary method we have
1 mole of Mg require 1 mole of MgO
0.125 Mole of MgO = 0.125mole of Mg
n = given mass /molar mass
0.125 = mass / molar mass
mass = 0.125* 24 = 3grams
Answer:
In first shell 2 electrons are present and 7 electrons are present in last shell
Explanation:
The number of moles of O atoms in 8.18 g of Ba(NO₃)₂ is 0.364 mol.
<h3>What is moles?</h3>
"The mole is a SI unit of measurement that is used to calculate the quantity of any substance." It is denoted by mol.
Given that the mass of Ba(NO₃)₂ is 8.18 g
n = m/M
n = moles = ? mol Ba(NO₃)₂
m = mass(g) = 8.18 gram(NO3)2
The molar mass of Ba(NO₃)₂ is 261. 35g/mol.
As given, the moles of oxygen atom in Ba(NO₃)₂ is 6.
So, the moles of oxygen in 8.18 gram will be
Putting the value in the formula:
0.0607 mol Mg(NO3)2 × 6 mol O atoms/mol Mg(NO3)2 = 0.364 mol O atoms to three significant figures.
Thus, the number of moles of O atoms is 0.364 mol.
To learn more about moles, refer to the link:
brainly.com/question/4220551
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