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A compound contains 28% of nitrogen and 72% of a metal by weight. Three atoms of the metal combine with two atoms of nitrogen. Find the equivalent weight of the metal.
$ Equivalent weight = { Atomic Weight \over Valency } $
The density of a $ 3M Na_2S_2O_3 solution is 1.25 g per mL, What is the molalities of Na^+ and S_2 O{ 2-} _3 $ ions ?
$ m = { 1000 M \over 1000d - MM_s } $ M = Molarity of solution d = density of solution $ M_s $ = Molar mass of solute $ = { 1000 \times 3 \over 1000 \times 1.25 - 3 \times 158 } = 3.865 $
Haemoglobin present in blood contain 3.72% by mass iron. Calculate the number of iron atoms in 2.0g of haemiglobin.
How many moles of magnesium phosphate, $ Mg_3(PO_4)_2$ will contain 0.25 mole of oxygen atoms (AEEE 2006)
In one molecule of magnesium phosphate, 8 oxygen atoms are present. Thus, 1 mole of magnesium phosphate will contain 8 moles of oxygen. Hence, 0.25 moles of oxygen atoms are present in 81×0. 25=3.
The density of Al metal is 2.7 gcm-3. An irregularly shaped piece of aluminium weighing 40.0g is added to a 100mL graduated cylinder containing 50.0mL of water. upto what height the water level will rise in the cylinder ?
$ d = { m \over v } $ $ V = { m \over d } = { 40 \over 2.7 } = 14.8cm ^ 3 $ Water level in cylinder = 50+ 14.8 = 64.8 mL
In which of the following pairs percent compostion of element is not same ?
What weight of CuO will be required to provide 200Kg copper
Choose the proper option after studying following statement (T = True, F = False)
Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the sample ?
The question is asking to find the percentage of pure ZnS (Zinc Sulfide) in the impure sample. Since the impure sample contains 42.34% Zn, the remaining percentage (100% - 42.34% = 57.66%) corresponds to the Sulfur (S) element. The formula of ZnS is Zn:S = 1:1, so the percentage of pure ZnS in the sample is 63%.
If the atomic mass of carbon were set at 50 amu, what would be the value of Avogadro’s number ? (
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