Element A (atomic weight 12.01) and element B (atomic weight 16) combine to form a new substance X. Two moles of B combine with one mole of A. Then the weight of one mole of X is........
Hint:
A + 2B ==> AB2 = X
You know A and you know 2B, add to obtain AB2. (Probably CO2).
To find the weight of one mole of substance X, we need to calculate the total atomic weight of the elements in the formula of substance X.
Given that two moles of element B combine with one mole of element A, we can determine that the molecular formula of substance X is AB2.
The atomic weight of element A is 12.01, and there is one A atom in one mole of substance X. Therefore, the contribution of element A to the total molecular weight is 12.01 * 1 = 12.01 g/mol.
The atomic weight of element B is 16, and there are two B atoms in one mole of substance X. Therefore, the contribution of element B to the total molecular weight is 16 * 2 = 32 g/mol.
Adding the contributions of both elements together gives us the total molecular weight of substance X: 12.01 g/mol + 32 g/mol = 44.01 g/mol.
Therefore, the weight of one mole of substance X is 44.01 grams.
To find the weight of one mole of substance X, we need to calculate the molar mass of X.
The molar mass is the sum of the atomic masses of all atoms in one mole of a substance.
Given that two moles of B combine with one mole of A, we can calculate the molar mass of X as follows:
Molar mass of A = atomic weight of A = 12.01 g/mol
Molar mass of B = atomic weight of B = 16 g/mol
Since we have two moles of B in one mole of X, the contribution of B to the molar mass of X is (2 moles of B) × (16 g/mol) = 32 g/mol.
For one mole of X, the weight contributed by A is (1 mole of A) × (12.01 g/mol) = 12.01 g/mol.
Finally, to find the weight of one mole of X, we add the contributions of A and B:
Weight of one mole of X = weight contributed by A + weight contributed by B
= 12.01 g/mol + 32 g/mol
= 44.01 g/mol
Therefore, the weight of one mole of substance X is 44.01 grams.