Molecular mass of $C a (O H)_{2}$ is :

61

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57

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74

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None of above

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Solution

The correct option is C $74$
Molecular mass of $C a (O H)_{2} = 1$ (Atomic mass of $C a$ ) $+ 2$ (Atomic mass of $O$ ) $+ 2 ($ Atomic mass of $H)$
$= 40 + 2 (16) + 2 (1)$
$= 40 + 32 + 2$
$= 74$

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^{61} C_{57} -^{60} C_{56}

^{61} C_{58}

^{60} C_{57}

{C a (O H)}_{2}

162 g / m o l

74 %

8.7 %

17.3 %

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