What is the total mass of half mole of hydrogen gas
Answers
Hydrogen has atomic mass 1.008 g/mol , which means that 1 atom of hydrogen is 1.008 g/mol
Because Hydrogen gas is diatomic, the molecule for Hydrogen gas is H2 , which means that one molecule of Hydrogen gas is 2 atoms of Hydrogen.
Since the molecule H2 has 2 hydrogen atoms, each weighing 1.008 g/mol ,
The molecular mass of H2 is 2∗1.008 g/mol=2.016 g/mol .
This means that 1 mole of H2 weighs 2.016 g
Which means that 4 moles of H2 weighs 4∗2.016 g= 8.064 g
Dihydrogen has a molar mass of 2.01∙g∙mol−1 . And note that I am perfectly justified in stating H2(g) ; we have assumed standard states, and conditions, and MOST gases with any chemistry are binuclear.
And so we take the product 4∙mol×2.01∙g∙mol−1=??∙g
And note the dimensional consistency of the answer .. we wanted an answer with units of mass, and the product gave us such units. Does this mean that we are absolutely right? Probably not, but at least we got some idea for once..
1 mole of hydrogen atom weighs 1 gram, so four moles of hydrogen atom weighs 4 g
But hydrogen only exists as molecules in gaseous form, so 1 mole of hydrogen molecule weighs 2 gram and 4 mole of hydrogen atom weighs 8 gram.
How much does a mole of hydrogen weigh?
What is the mass in grams of 1 mole of hydrogen gas?
How many moles of hydrogen gas are present in 4G of hydrogen?
One mole of hydrogen weighs 2 g.
Therefore 4 moles of hydrogen weighs 8 g.
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Answer:
mole=given mass/ molar mass
1/2=given mass/2
mass=(1/2)×2
=1g