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Katelyn Richard
Chemistry
22 January, 06:00
Calculate the number of moles in 8.00 g of He
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Guzman
22 January, 06:22
0
2 moles
Explanation:
Mole:
Mole is the unit of amount in chemistry. It is SI unit and represented by "mol".
Example:
one mole of hydrogen has a mass of 1.008 g and contain 6.022 * 10∧23 atoms.
Steps to find the number of moles:
1. If the number of grams are given then to find out the moles first of all we will find the molar mass of given chemical substance.
For example:
If the given chemical substance is NaOH then its molecular weight is determine through following way:
atomic mass of Na = 1*22.989 g/mol
+
atomic mass of oxygen = 1*16 g/mol
+
atomic mass of hydrogen = 1 * 1.008 g/mol
molecular mass of NaOH = 39.97 or 40 g/mol
2. when the molar mass and grams are known then number of moles are determine through following formula:
number of moles = mass in gram / molar mass (g/mol)
Given dа ta:
Now we will put the values in formula,
number of moles = 8.00g/4 g/mol
number of moles = 2 mol
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