The mass number of hydrogen is 2
The mass number of helium is 4
The mass number of boron is 7
Answer : The mass of 
required is, 61.82 grams.
Explanation :
First we have to calculate the moles of 
Now we have to calculate the moles of .
The balanced chemical equation is:
From the balanced reaction we conclude that
As, 1 mole of react with 6 mole of
So, 0.322 moles of react with 
moles of
Now we have to calculate the mass of
Molar mass of = 32 g/mole
Therefore, the mass of required is, 61.82 grams.
Answer:
<u><em>Fundamental Units:</em></u>
1) Fundamental units also called base units are used to describe base quantities
2) They cannot be expressed in terms of derived units.
3)<u> Examples :</u> Meter, Ampere, Second etc.
<u><em>Derived Units:</em></u>
1) Derived units are used to describe derived quantities.
2) They can be expressed in terms of fundamental units.
3)<u> Examples: </u>Newton, Joule, Hertz, Pascal etc.
