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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Explanation:
We will balance equation which describes the reaction between sulfuric acid and sodium bicarbonate: as follows.
Next we will calculate how many moles of are present in 85.00 mL of 1.500 M sulfuric acid.
As, Molarity =
1.500 M =
n = 0.1275 mol
Now set up and solve a stoichiometric conversion from moles of to grams of
. As, the molar mass of
is 84.01 g/mol.
= 21.42 g
So unfortunately, 15.00 grams of sodium bicarbonate will "not" be sufficient to completely neutralize the acid. You would need an additional 6.42 grams to complete the task.