The atomic weight of two elements A and B are 20 and 40 respectively. Which of the following statement(s) is/are correct for those two elements?

Engineering

Chemistry

Chemical Equation and Stoichiometric Calculation

Question

At STP, ratio of mass of x L monoatomic gas A to mass of gas B is 2 : 1.

x g of A contains y atoms which is equal to atoms present in x g of B.

At STP, mass of x L of monoatomic gas A is equal to that of x L of monoatomic gas B.

x g of A contains y atoms which is equal to atoms present in 2x g of B.

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A B
Atomic weight 20 40
1 mol 1 mol
x gm of A,
Suppose 10 g of A = $\frac{1}{2}$ mol of A = $\frac{1}{2}$ mol of B
= 20 g of B = 2x g of B
hence , x g of A and 2x g of b will contain same number of atoms
x L of A;
Suppose 11.2 L of A = $\frac{1}{2}$ mol of A = $\frac{1}{2}$ mol of B = 11.2 L of B
hence, at STP x mL of A = x mL of B