Questions in chemical-aritmatic

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	Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is
	What quantity of ammonium sulphate is necessary for the production of $N{H_3}$gas sufficient to neutralize a solution containing 292 g of $HCl$? [HCl=36.5; ${(N{H_4})_2}S{O_4}$=132; $N{H_3}$=17]
	The percentage of ${P_2}{O_5}$in diammonium hydrogen phosphate ${(N{H_4})_2}HP{O_4}$is
	If $1\frac{1}{2}$moles of oxygen combine with Al to form $A{l_2}{O_3}$the weight of Al used in the reaction is (Al=27)
	The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight=78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
	${H_2}$ evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous $NaOH$ would be
	What is the % of ${H_2}O$in $Fe{(CNS)_3}.3{H_2}O$
	What weight of $S{O_2}$can be made by burning sulphur in 5.0 moles of oxygen
	What is the normality of a 1 M solution of ${H_3}P{O_4}$
	Normality of 2M sulphuric acid is