Answer: 55.56 moles of MgO
Explanation:
1 mole = avogadro number
if 6.21x10^25 atoms then molecules of MgO (equal numbers of Mg and O atoms)
= 0.5*6.21x10^25 = 3.105 molecules of MgO
So moles of MgO = 0.5*6.21*10^25/avogadro number = 55.56
Answer:
See the picture... I hope that's the answer
Answer:
Mass = 0.61 g
Explanation:
Given data:
Pressure of neon gas = 720 mmHg
Temperature = -15.0°C
Volume = 760 mL
Mass of neon gas = ?
Solution:
720 mmHg = 720/760 = 0.95 atm
-15.0°C + 273 = 258 K
760/1000 = 0.76 L
PV = nRT
n = PV/RT
n = 0.95 atm ×0.76 L/ 0.0821 atm. L. k⁻¹.mol⁻¹× 258 K
n = 0.722 atm. L/ 21.2 atm. L. mol⁻¹
n = 0.03 mol
Mass of neon:
Mass = number of moles × molar mass
Mass = 0.03 mol × 20.2 g/mol
Mass = 0.61 g
Answer:
im pretty sure its 2.7 gms
Explanation:
im not for sure tho
Answer:
The chemical change in matter is results in a change in its identity and properties.
Explanation:
There are toe type of changes physical change and chemical change.
The chemical change change in matter lead to lost its identity and properties.
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H 2 (g) + O 2 (g) -------------------------------------> 2H 2O (l)
