mass of 5.84*10^21 atoms of Helium

Asked by tarshith2006 | 29th May, 2020, 05:19: PM

Expert Answer:

Firstly, We will calculate number of moles of He atoms. 
Number space of space moles space in space space 5.81 cross times 10 to the power of 21 space atoms space of space He equals space fraction numerator 5.81 cross times 10 to the power of 21 over denominator 6.022 cross times 10 to the power of 23 end fraction equals 0.964 cross times 10 to the power of negative 2 end exponent equals 9.64 cross times 10 to the power of negative 3 end exponent space moles

Mass space of space one space mole space of space He space atom space is space equals space 4 space amu
So comma space mass space of space 9.64 cross times 10 to the power of negative 3 end exponent space moles space of space He space atom equals space 4 cross times 9.64 cross times 10 to the power of negative 3 end exponent equals 38.56 cross times 10 to the power of negative 3 end exponent space amu

Answered by Ravi | 29th May, 2020, 06:52: PM