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How many moles of lead are there in1.204*10^22 atoms of lead .what is the mass of 1.204*10^22atoms of lead ( atomic mass of pb =207u)
Asked by dev15_1974 | 10 Mar, 2018, 12:19: PM
answered-by-expert Expert Answer
 
Given colon 1.204 cross times 10 to the power of 22 space atoms space of space space Pb No. space of space moles space of space Pb space equals space ? We space know space that comma Avogadro apostrophe straight s space no. space of space atoms space equals space 1 space mole space of space Pb 6.023 cross times 10 to the power of 23 space end exponent atoms space equals space 1 space mole therefore 1.204 cross times 10 to the power of 22 space atoms space equals space apostrophe straight x apostrophe space moles space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space space fraction numerator 1.204 cross times 10 to the power of 22 space cross times 1 over denominator 6.023 cross times 10 to the power of 23 space end exponent end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 0.01999 space moles space space therefore 1.204 cross times 10 to the power of 22 space atoms space space almost equal to space 0.02 space moles space of space Pb Now comma space 1 space mole equals space 204 space gm 0.02 space moles equals space apostrophe straight y apostrophe apostrophe space space space space space space space space space space space space space space space space space space equals fraction numerator 204 cross times 0.02 over denominator 1 end fraction space space space space space space space space space space space space space space space space space space space space space space equals 4.08 space gm space of space Pb 0.02 space moles equals space 4.08 space gm
Answered by Varsha | 10 Mar, 2018, 02:00: PM

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