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.
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Examples of Physical Changes<span>crushing a can.melting an ice cube.boiling water.mixing sand and water.breaking a glass.dissolving sugar and water.shredding paper.<span>chopping wood.</span></span>
Answer:
167 kJ
Explanation:
Given parameters
Change in enthalpy = 130 kJ (decrease)
Work done = -137 kJ
Change in energy, \delta = ?
From the first law of thermodynamics:
ΔH = ΔE + PΔV,
Where, ΔH= change in enthalpy
ΔE = change in Internal energy
Substituting values into the above formula —
130 kJ = ΔE + -137 kJ
130 kJ = ΔE - 137 kJ
therefore,
ΔE = (130 + 137 ) kJ
ΔE = 167 kJ
Therefore, the change in energy of the gas mixture during the reaction is 167 kJ.
Since the value of energy change Is positive, therefore this Is endothermic reaction
D. Chadwick showed that atoms cannot contain neutral particles.
Atoms do in fact contain neutrons in their nuclei.
