An element X has the following isotopic composition:
200X : 90%
199X : 8.0%
202X : 2.0%
The weight average atomic mass of the naturally occurring element X is closest to :
Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g ml–1and mass per cent of nitric acid in it being 69%.
How much copper can be obtained from 100 g of copper sulphate(CuSO4)? (Atomic mass of Cu =63.5amu)
What is the concentration of sugar if its 20 g are dissolved in enough water to make a final volume up to 2 L?
If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?
What will be the mass of one12C atom in g?
What is the mass in grams of one molecule of caffeine (C8H10N4O2)?
What is the equivalent weight of KH(IO3)2 as an oxidant in presence of 4.0 (N) HCl when ICI becomes the reduced from?
Calculate the molar mass of water if it contains 50% heavy water (D2O).
In the reaction,
2 Al(s) + 6 HCl (aq) → 2 Al3+(aq) + 6 Cl– (aq) + 3 H2 (g)
The crystalline salt Na2SO4.xH2O on heating losses 55.9% of its weight. The formula of the crystalline salt is