A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?

Mass of boron = 0.096g           (Given)  Mass of oxygen = 0.144g        (Given)  Mass of sample = 0.24g          (Given)  Thus, percentage of boron...

(a) 1 mole of iron (Fe) = 56 g (molar mass)  Since 56 g of iron = 1 mol  Therefore, 112 g of iron= 1/ 56 ×112 mol = 2 mol  (b) Molar...

(a) Number of moles of Ca = Given mass of calcium / Molar mass of calcium = 60 / 40 = 1.5 moles  (b) Number of moles = Given number of molecules...

(a) Mass of sodium atoms carried by Krish = (5 × 23) g = 115 g While mass of carbon atom carried by Raunak = (5 ×12) g = 60g...

Number of moles of stars =   1022 / 6.023×1023                                           = 0.0166 mols

One gram of gold sample will contain 90/100 =0.9g of gold    Number of moles of gold = Mass of gold/ Atomicmass of gold                 ...

The right answer is c

(b) : 1mole of Mg3 (PO4 )2 => 3moles of Mg atom + 2 moles of P atom + 8 moles of O atom 8 moles of oxygen atoms are present in...

(d) both A and B are correct.

The correct answer is (a) argon