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ICSE Class 9 Answered

Caculate the no. of moles of phosphorous in 91.0 g of phosphorous assuming that the molecular formula of phosphorous is P4.Also calculate the no. of atoms and molecules of phosphorous in the sample ?
Asked by nisha_vini29 | 17 Mar, 2016, 09:13: AM
answered-by-expert Expert Answer
A t o m i c space m a s s space o f space p h o s p h o r u s space a t o m space i s space 30.9 space straight g M o l a r space m a s s space o f space straight P subscript 4 space space end subscript m o l e c u l e space i s space 123.6 space straight g 1 space m o l e space straight P subscript 4 space space identical to space 123.6 space straight g space straight P subscript 4 space H e n c e comma space 91 space straight g space straight P subscript 4 space identical to space bold 0 bold. bold 736 bold space bold moles bold space bold P subscript bold 4 1 space m o l e space straight P subscript 4 space identical to space 6.023 space cross times space 10 to the power of 23 space m o l e c u l e s space o f space straight P subscript 4 space space end subscript H e n c e comma space 0.736 space m o l e s space straight P subscript 4 space identical to space bold 4 bold. bold 434 bold cross times bold 10 to the power of bold 23 space m o l e c u l e s space o f space straight P 4 space 1 space m o l e c u l e space straight P subscript 4 space identical to space 4 space a t o m s space o f space p h o s p h o r u s H e n c e comma space 4.434 cross times 1023 space m o l e c u l e s space o f space straight P subscript 4 space identical to space 4 cross times 4.434 cross times 10 to the power of 23 space straight P space a t o m s space space equals space bold 17 bold. bold 736 bold space bold cross times bold space bold 10 to the power of bold 23 space straight P space a t o m s
Answered by Prachi Sawant | 17 Mar, 2016, 12:16: PM

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