What is the formula mass of $B a (H S O_{3})_{2}$ ?
Atomic mass of Ba is 137 u

299 u

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250 u

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290 u

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260 u

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Solution

The correct option is A 299 u
Formula mass of $B a (H S O_{3})_{2}$

$= 1 \times a t o m i c m a s s o f B a + 2 \times a t o m i c m a s s o f H + 2 \times a t o m i c m a s s o f S$
$+ 6 \times a t o m i c m a s s o f O$

$= (1 \times 137 + 2 \times 1 + 2 \times 32 + 6 \times 16)$ u

$= (137 + 2 + 64 + 96)$ u

$= 299$ u

Hence, the correct option is $A$

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