The number of molecules in 16 g of oxygen gas is _______. (A) 6.022 x

1.	The number of molecules in 16 g of oxygen gas is _______. (A) 6.022 x 1023 (B) 3.011 x 1023 (C) 3.011 x 1022 (D) 1.5 x 1023
Answer» Correct option: (B) 3.011 x 10²³ Number of molecules = n x 6.022 x 10²³ Now, n = \(\cfrac{mass\, of\, oxygen}{molar\, mass\, of\, oxygen}\) = \(\frac{16}{32}\) = 0.5 ∴ Number of molecules = 0.5 x 6.022 x 10²³ = 3.011 x 10²³

The number of molecules in 16 g of oxygen gas is _______. (A) 6.022 x 1023 (B) 3.011 x 1023 (C) 3.011 x 1022 (D) 1.5 x 1023

Answer»

Correct option: (B) 3.011 x 10²³

Number of molecules = n x 6.022 x 10²³

Now, n = \(\cfrac{mass\, of\, oxygen}{molar\, mass\, of\, oxygen}\) = \(\frac{16}{32}\) = 0.5

∴ Number of molecules = 0.5 x 6.022 x 10²³

= 3.011 x 10²³