The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below
2 answers:
Answer:
Lithium has 4 neutrons
Explanation:
The number shown above the lithium symbol (Li) is the mass number.
The mass number (A) represents the protons and neutrons an atom has.
The atomic number(Z) in the other hand represents the protons only.
So, the difference between this two numbers is the amount of neutrons.
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Answer: The mass of molecules of phosphorus pentoxide is 20.5 g
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.
To calculate the moles, we use the equation:
1 mole of weigh = 283.9 g
Thus 0.0772 moles of weigh =
Thus the mass of molecules of phosphorus pentoxide is 20.5 g