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:
False. One mole of a certain substance will always contain atoms of that substance.
Explanation:
Hope this helped!
43.56 grams of are produced if 16g of CH4 reacts with 64g of O2.
Explanation:
Balance equation for the reaction:
CH4 + 2O2⇒ CO2 +2H2O
Data given : mass of CH4 =16 grams atomic mass = 16.04 grams/mole
mass of water 36 gram atomic mass = 18 grams/moles
mass of CO2=? atomic mass = 44.01 grams/mole
number of moles = equation 1
number of moles in CH4
n =
= 0.99 moles
Since combustion is done in presence of oxygen hence it is an excess reagent and methane is limiting reagent so production of CO2 depends on it.
From the equation
1 mole of CH4 gave 1 mole of CO2
O.99 moles of CH4 will give x moles of CO2
=
x = 0.99 moles of carbon dioxide
grams of CO2 = number of moles x atomic mass
= 0.99 x 44.01
= 43.56 grams of CO2 is produced.