Question

calculate number of atom in 10g of helium and atomic mass of helium​

Answer 1

Explanation:

• N=n×avagadro no. ~1

n=w/Mw ~2

w=10g

Mw=4gram/mole

At.w=?

• Now put data in equation 2
• n=10/4
• n=2. 5 mole
• Now put value of n in 1
• N=2. 5 × 6. 022×10^23
• N=15. 055×10^23
• No. Of particles in 10g he is 15. 055×10^23

Now for atomic weight,

• Molecular weight = at. W ×N
• at. W = Molecular weight /N
• at. W =4÷15. 055×10^23
• at. W=0. 26569×10^-23

Answer 2

ᴀɴꜱᴡᴇʀ

ᴀɴꜱᴡᴇʀ15.055× 10^23

ᴀɴꜱᴡᴇʀ15.055× 10^23 ᴇxᴩʟᴀɴᴀᴛɪᴏɴ:

N= W/ M × No

N= W/ M × NoN=10g/4 × 6.022×10^23