Question

Element A reacts with oxygen to form a compound A2O3. If 0.359 gram of A compound contains 0.128 g of oxygen. Atomic weight of A will be​

Answer 1

Answer:

ANSWER

Let atomic mass of element A be =a g/mol

Again atomic mass of oxygen = 16 g/mol

So molar mass of the compound A2O3=(2a+48)g/mol

One molecule of the compound A2O3 Contains 2 atoms.

So the ratio of mass of A and A2O3 in a molecule 2a+482a

Again it is given that 0.359 grams of A reacts to give 0.559 grams of the compound. So we can write

=>2a+482a=0.5590.359

=>a+24a=559359

On solving, a=43.08

So, the correct option is B