InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
pe of element X has 12 neutrons and 11 protons which of the following shows the83. An isotocorect symbol of theion formed by x?23 +(D) x3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms inthe solution are-(A) 668y1023(B) 6.09x10(C) 6.022 x 1023(D) 6.022x1021 |
|
Answer» Molecular mass of sucrose=342 umolar mass = 342 ggiven mass =3.42 ggiven mass in terms of molar mass = 1/100 of molar massNo. of molecules in 1 mole =6.022*10^23No. of molecules in given mass = 1/100 * 6.022*10^23=6.022*10^21No.of oxygen atoms in 1 molecule of sucrose =11No.of oxygen atoms in 6.022*10^21 molecules =11*6.022*10^21=6.6242*10^22atomsNow,given water 18gmolecular mass of water = 18 ugiven water = 18g = 1 moleno.of oxygen atoms in 1 molecule of water = 1 No. of oxygen atoms in 6.022*10^23 molecules =1*6.022*10^23=6.022*10^23 atoms Total no. of oxygen atoms inthe solution =6.022*10^23+0.66242*10^23=6.68442*10^23 atoms |
|