What is the mass of one molecule of yellow phosphorus ? (Atomic mass, P = 30)

Question

What is the mass of one molecule of yellow phosphorus ? (Atomic mass, P = 30) (A) 1.993 × 10-22 kg (B) 1.993 × 10-19 mg (C) 4.983 × 10-20 mg (D) 4.983 × 10-23 kg

Tardigrade Admin · Accepted Answer

Yellow phosphorus is an impure form of white phosphorus

(P_{4})

Molecular mass of yellow phosphorus

(P_{4})

= 4 \times 30 = 120

∴

According to Avogadro's hypothesis,

Mass of

6.022 \times 1 0^{23}

molecules

= 120 g

and mass of 1 molecule

= \frac{120 \times 1}{6.022 \times 1 0 ^{23}}

= 19.926 \times 1 0^{- 23} g

= 1.993 \times 1 0^{- 22} g

= 1.993 \times 1 0^{- 19} m g

Q. What is the mass of one molecule of yellow phosphorus ? (Atomic mass, $P = 30$ )

$1.993 \times 1 0^{- 22} k g$

$1.993 \times 1 0^{- 19} m g$

$4.983 \times 1 0^{- 20} m g$

$4.983 \times 1 0^{- 23} k g$

Q. What is the mass of one molecule of yellow phosphorus ? (Atomic mass, P=30)

1.993×10−22kg

1.993×10−19mg

4.983×10−20mg

4.983×10−23kg

Yellow phosphorus is an impure form of white phosphorus (P4​) Molecular mass of yellow phosphorus (P4​) =4×30=120 ∴ According to Avogadro's hypothesis, Mass of 6.022×1023 molecules =120g and mass of 1 molecule =6.022×1023120×1​ =19.926×10−23g =1.993×10−22g =1.993×10−19mg

Q. What is the mass of one molecule of yellow phosphorus ? (Atomic mass, $P = 30$ )

$1.993 \times 1 0^{- 22} k g$

$1.993 \times 1 0^{- 19} m g$

$4.983 \times 1 0^{- 20} m g$

$4.983 \times 1 0^{- 23} k g$