How many grams of `KCIO_3` must be decomposed to prepare 3.36 litres of oxygen at STP? (Atomic weight of K = 39, Cl = 35.5, O = 16 u)

How many atoms are present in 1 ml of NH_3 at STP?

1.00 g of EuCl_(2) , is treated with excess of aqueous AgNO_(3) and all the chlorine is recovered as 1.29 g of AgCl. Calculate the atomic weight of Eu. (Cl = 35.5, Ag = 108)

A sample of pure Ca metal weighing 1.35 grams was quantitatively converted to 1.88 grams of pure Cao. What is the atomic weight of Ca? (O = 16)

How many moles of magnesium phosphate 'Mg_3(PO_4)_2' will contain 0.25 mole of oxygen atom?

4.008 g of pure KCIO_(3) , was quantitatively decomposed to give 2.438 g of KCl and oxygen. KCl was dissolved in water and treated with AgNO, solution. The result was a precipitate of AgCl weighing 4.687 g. Under further treatment, AgCl was found to contain 3.531 g of Ag. What are the atomic weights of Ag, Cl and K relative to O = 16?

How many moles of HCOONa must be added to 1L of a 0.1 M solution of HCOOH in order to prepare a buffer solution of pH = 3.4? (Given : K_(a) of HCOOH =2 times 10^(-4) at 298 K)

How many seconds will be required to produce 1.0 g of silver (atomic weight = 108) metal by the electrolysis of a AgNO_(3) solution using a current of 30 amps? (F = 96500 coul. "Mol"^(-1) )

The number of moles in 400g CaCO_3 ...... (Hint , Gram atomic mass , Ca = 40g, C = 12g, O = 16g)

How many litres of SO_(2) taken at NTP have to be passed through a solution of HCIO_(3) to reduce 16.9 g of it to HCI?