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If 2 g of element X combines with 7 g of element Y to form compound XY, how many grams of Y

are needed to form compound XY2?

(1 Point)

Respuesta :

jufsanabriasa

Answer:

14g of Y to form the compound XY₂

Explanation:

In the compound XY, you have 1 mole of X and 1 mole of Y. Thus, you can imagine the molar mass of X is 2g/mol and molar mass of Y is 7g/mol.

Now, in the compound XY₂, you have 1 mole of X but 2 moles of Y.

If you have 2g of X, in this case you will need:

2 moles Y * (7g / mol) =

14g of Y to form the compound XY₂

adioabiola

The amount of element Y needed to form compound XY2 is; 14g of element Y.

From the law of conservation of mass which states that;

Matter can never be created nor destroyed.

By stoichiometry;

Since:

7 g of element Y to form compound XY(y =1)

a g of element Y to form compound XY2(y =2)

In essence,

a g = (2 × 7g)/1

a = 14g

Therefore, 14g of element Y is needed to form compound XY2.

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