I know the answer is \"A\" but I need a simple breakdown on how the answer is \"

Question

I know the answer is "A" but I need a simple breakdown on how the answer is "A". If you can add an additional example I would appreciate it. 6) What is the coefficient in front of the c when the following reaction is balanced? CO2 (g) Fe203 (s) C (s) Fe (s) (A) 3 B) 2 E) 5 F) 1 D) 6 7) What is on the product side of the balanced net ionic equation (NIE) when solutions of Cu2so4 (aa) and (NH4) 3PO4(aq are combined? A) Cu3PO4 (s) B) (NH4)3SO4 (s) C) 3 Cu2PO4 (s) D) 3 (NH4)2SO4 (s) E) 2 (NH4)3so4 (s) (F) 2 Cu3(PO4)2 (s) 8) A 1.8 mole sample of compound has a mass 126.2 g. If the empirical formula of the compound is CH2, what is its molecular formula? C) C4H8 A) C3H6 B) C5H10 E) CH2 F) C6H12 D) C2H4

Explanation / Answer

1.4Fe + 3CO2------> 2Fe2O3+3C, this is the balanced reaction and the coefficient of c in the reaction is 3 ( A is correct)

2.Cu2SO4 + 2 (NH4)3PO4 = 3 (NH4)2SO4 + 2 Cu3PO4 ( balanced reaction)

the correct answer is Cu3PO4. A is correct.

3. moles= mass/molar mas

molar mass= mass/moles= 126.2/1.8=70

empirical formula= CH2

molar mass of empirical foruma =12+2=14

empritical formula * n= 70, n= reeating empirical units

14*n= 70, n=5

molecular formula is (CH2)5= C5H10. ( B is correct)

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