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Standard IX

Chemistry

Molar Mass

Question 6c C...

Question

Question 6(c)
Calculate the molar mass of the following substances:
(c) Phosphorus molecule, $P_{4}$ (atomic mass of phosphorus = 31)

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Solution

(c) Phosphorus molecule, $P_{4}$ (atomic mass of phosphorus = 31)
$\to$ Molar mass of phosphorus molecule, $P_{4} = 4 \to 31 = 124 g$

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Q. Question 6(c)
Calculate the molar mass of the following substances:
(c) Phosphorus molecule,

P_{4}

(atomic mass of phosphorus = 31)

Q. 124 amu of P4 will contain:(at mass of P=31) how many atoms or molecules of phosphorus?

Q. Calculate the molecular mass of the following substances:

(a) Ethyne

(C_{2} H_{2})

(b) Sulphur molecule

(S_{8})

(P_{4})

(d) Hydrochloric acid

(H C l)

(e) Nitric acid

(H N O_{3})

$112 c m^{3}$ of a gaseous fluoride of phosphorus has a mass of 0.63 g. Calculate the relative molecular mass of the fluoride. If the molecule of the fluoride contains only one atom of phosphorus, then determine the formula of the phosphorus fluoride.
[F = 19; P = 31].

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Molar Mass

Standard IX Chemistry

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Question 6(c) Calculate the molar mass of the following substances: (c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)

(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31) → Molar mass of phosphorus molecule, P4=4→31=124 g

Question 6(c)
Calculate the molar mass of the following substances:
(c) Phosphorus molecule, $P_{4}$ (atomic mass of phosphorus = 31)

(c) Phosphorus molecule, $P_{4}$ (atomic mass of phosphorus = 31)
$\to$ Molar mass of phosphorus molecule, $P_{4} = 4 \to 31 = 124 g$