Calculate The Molar Mass Of Water If It Contains 50% Heavy Water (D2O).

Calculate the mass of sodium acetate (CH₃COONa) required to make500mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol^–1. 

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?

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 :

 In the reaction,

      2 Al(s) + 6 HCl (aq) → 2 Al³⁺(aq) + 6 Cl^– (aq) + 3 H₂ (g)