Ques 11

Ques 11 (3) 3.86 x 105 c (4) 1.93 x 105 c 9. 10. 11. 12. 13. Calculate the percentage of water of crystalline in Blue vitrial (CuS04_5H20) (Atomic masses are given as cu = 63.5, S = 32, 16, H = 1) (1) 7.2% (3) 56.42% (2) 36% (4) 64% A non-reacting gaseous mixture contains SOZ and S03 in the mass ratio of 1 : 5. Find the ratio of the number of molecules A hydrocarbon contains 91.3% carbon by mass. Find the empirical formula of hydrocarbon? (1) CH (2) C2H3 (4) C3H5 An organic compound of carbon, hydrogen and nitrogen contains these elements having mass percentage 66.67%, 7.41% and 25.92% respectively. Calculate empirical formula. (1) C3H4N (3) C4H4N (2) C2H6N (4) CdH9N Myoglobin Stores oxygen for metabolic process in muscle. Chemical analysis shows that it contains 0.32% Fe by mass. If there is one Fe atom per molecule of myoglobin, What is the molar mass of myoglobin? [Fe = 56] (1) 1.75 x 104 g/rnol (2) 3.5 x 105 g/mol (3) 1 x 104q/

Dear Student,
The atomic weight of carbon is 12 and atomic weight of hydrogen is 1.
Carbon is 91.3% and hydrogen is 8.7%.
So fraction of carbon is 91.3/12 = 7.60 and
fraction of hydrogen is 8.7/1 = 8.7
Their ration is approximately 2:3
So the emperical formula of the compound may be C2H3
​Regards
 

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Ans is C2H3

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Mayank Singh is right
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