The hydrate salt `Na_2 CO_3.xH_2O` undergoes `63%`loss in mass on heating and becomes anhydrous. The value of `x` is :

T/F Rust is Fe_2O_3. xH_2O

Common name of Na_2 CO_3 . 10H_2O

A 6.85g sample of the hydrated Sr(OH)_2.x H_2O is dried in an oven to given 3.13g of anhydrous sr(OH)_2. What is the value of x? (Atomic masses : Sr=87.60.O=16.0,H=1.0)

Find the maximum and minimum value of 3 sin 2x+4 cos 2x+3 .

A gaseous mixture of H_2 and CO_2 gases contains 66 mass % of CO_2 . The vapour density of the mixture is :

The equivalent mass of the salt, KHC_2O_4.H_2C_2O_4. 4H_2O when it act as reducing agent is :

Calculate the formula mass of: Na_2 CO_3 * 10H_2O

6.2g of a sample containing Na_2CO_3, NaHCO_3 and non-volatile inert impurity on gentle heating loses 5% of its mass due to reaction 2NaHCO_3 rarr Na_2 CO_3 + H_2 O + CO_2 . Residue is dissolved in water and formed 100mL solution and its 10mL portion requires 7.5 mL of 0.2M aqueous solution of BaCI_2 for complete precipitation of carbonates. Determine mass (in gram) of Na_2 CO_3 in the original sample.

If cos(sin^(-1)""(2)/(3)+cos^(-1)x)=0 , then find the value of x.