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8.5g of hydrated copper (ii) sulphate CuSO_4 .xH_2 O was heated to dryness.if 4.0g of anhydrous copper (ii) sulphate[CuSO_4 ] obtain Find number of molecule of water of crystallization

$8 . 5 g of hydrated copper (ii)$ $sulphate {CuSO}_{4} . {xH}_{2} O was heated$ $to dryness . if 4 . 0 g of anhydrous$ $copper (ii) sulphate [{CuSO}_{4}] obtain$ $Find number of molecule of water of$ $crystallization$

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2.86g of hydrated Sodium carbonate Na_2 CO_3 .nH_2 O was dissolved into water to make 250cm^3 solution of 0.04M Find the value of n

$2 . 86 g of hydrated Sodium carbonate$ ${Na}_{2} {CO}_{3} . {nH}_{2} O was dissolved$ $into water to make {250 cm}^{3} solution$ $of 0 . 04 M Find the value of n$

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please help A 7.38 g sample of magnesium sulfate MgSO_4 . X H_2 O lost 3.78g of water on heating, find the value of X.

$p l e a s e h e l p$ $A 7.38 g s a m p l e o f m a g n e s i u m s u l f a t e {M g S O}_{4} . X H_{2} O l o s t 3.78 g o f$ $w a t e r o n h e a t i n g, f i n d t h e v a l u e o f X .$

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