Which one of the following statements is a correct summary of the law of definit

Question

Which one of the following statements is a correct summary of the law of definite proportions (which is sometimes called the law of constant composition)? If 3.5g of compound A reacted exactly with 5.7g of compound B to form the new compounds C and D, which one of the following pairs can be the only possible masses of C and D formed? Which statement below correctly describe the given reaction? Mg(s) + HCl(aq) rightarrow MgCl_2 (aq) + H_2(g) Which of the following correctly represents what happens when (NH_4)_3PO_4 is mixed with water?

Explanation / Answer

12. D

13. A, the only one where mass is conserved.

14. E, Mg is oxidized from Mg0 to Mg+2, and H is reduced from H+ to H0

15. B. (NH4)3PO3 will dissociate in two ions, 3 ions of NH4+ and 1 PO4-3 ion

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