GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
How many atoms are present in 46 u of Na
|
|
46
|
|
|
23
|
|
|
1
|
|
|
2
|
Explanation:
Detailed explanation-1: -46u of sodium contains(a) 2 atoms of sodium.
Detailed explanation-2: -∴ 46 g of Na contains 12.044×1023atoms.
Detailed explanation-3: -So here the number of moles of sodium of 46g sodium is 2 moles, the correct option is option (B).
Detailed explanation-4: -The atomic mass of each He is 4.003, to be precise. That means the group of each atom is 4.003 amu. Then the 52 u of He has 52/4.003, which is 12.99 means 13. So, 52 u of He has 13 atoms.
Detailed explanation-5: -ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na. Avogadro’s Number is 6.023x1023.
There is 1 question to complete.