Kind explain question number 72 and 73

Kind explain question number 72 and 73 try Iin metal has formula MHPO :ould be : MC12 MC13 •f NH3 is approximately : 1.5* 1023 6 x 1023 4. 71. Physical Chemistry (Xl)-Question Bank A signature written with carbon pencil weighs I mg. Whatis Some Basic the number of carbon atoms present in the signature ? (l) 6.02 x 1020 ey/o.502x 1020 (3) 5.02x 1023 82. There are two isotopes of an element with atomic mass z; Heavier one has atomic mass z + 2 and lighter one has 83 z — I, then abundance of lighter one is : 2.24 L of volume at standard gas may be • Carbon monoxide Sulphur dioxide x IO- cc. Calculate the no. of I /3.01 1012 3.01 1024 in : 28g 54g ofN205 STPis: 0.8g 1.6g (1) 66.6% (3) 667% (2) 96.7% (4) 33.3% 73 74. 75. Which of the following contains maximum number o! 84. molecules? (1) IOOccofC02atSTP (2) 150 ccofN2atSTP 200 at STP (3) 50 ccofS02atSTP 85. The numerical value ofN/n (where N is the number ofmoleculq in a given sample of gas and n is the number of moles of tw gas) is : (1) 8314 (3) 0.0821 of 6.02 x (4) 1.66 x 10-24 86. A sample ofphosphorus trichloride (PC13) contains 1.4 mol of the substance. How many atoms are there in the sample? (2) 5.6 If 1021 number o 2.88 (3) 4.54 The equi' when it i: The nun 6.02 x 10 (1) log- (3) lg-n The mass (1) 413 (3) 4.15 How mar (1) 6.02' 6.02 9.10