The formula unit mass of $C a_{3} (P O_{4})_{2}$ is :

360

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240

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118

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310

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Solution

The correct option is D $310$
Mass of $C a_{3} (P O_{4})_{2}$
$= (3 \times$ atomic mass of Ca $) + (2 \times$ atomic mass of phosphorus $) + (8 \times$ atomic mass of oxygen) $= 3 \times 40 + 2 \times 31 + 8 \times 16 = 310$

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Question 44
Fill in the blanks

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ___.

(b) A group of atoms carrying a fixed charge on them is called ___.

(c) The formula unit mass of $C a_{3} (P O_{4})_{2}$ is ____.

(d) Formula of sodium carbonate is ___ and that of ammonium sulphate is ____.

Q. What is the molar mass of

C a_{3} (P O_{4})_{2}

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The formula unit mass of Ca3(PO4)2 is :

The correct option is D 310Mass of Ca3(PO4)2 =(3× atomic mass of Ca)+(2× atomic mass of phosphorus)+(8×atomic mass of oxygen) =3×40+2×31+8×16=310

The formula unit mass of $C a_{3} (P O_{4})_{2}$ is :

The correct option is D $310$
Mass of $C a_{3} (P O_{4})_{2}$
$= (3 \times$ atomic mass of Ca $) + (2 \times$ atomic mass of phosphorus $) + (8 \times$ atomic mass of oxygen) $= 3 \times 40 + 2 \times 31 + 8 \times 16 = 310$