24.3 g of magnesium yield 40.3 g MgO upon combustion with oxygen. ...

[DelorasTo]

24.3 g of magnesium yield 40.3 g MgO upon combustion with oxygen. How much magnesium needs to be burned to yield 12.1 g MgO?
 
  A) 4.30 g
  B) 6.10 g
  C) 7.30 g
  D) 8.40 g

Question 2

Which of the following substances is not a necessary dietary mineral?
 
  A) CO32-
  B) SO42-
  C) PO43-
  D) Cl-
  E) K+

Question 3

Why is the formation of iron hydroxide, Fe , from and O not considered an oxidation-reduction reaction?
 
  A) The iron is only oxidized and nothing is reduced.
  B) The iron is only reduced, not oxidized.
  C) The ion is not changed during this chemical reaction.
  D) Iron can never be oxidized or reduced.

[abro1885]

Answer to Question 1

C

Answer to Question 2

A

Answer to Question 3

C

[DelorasTo]

TYSM

[Jsherida]

Gracias!