8. Which one of the following is correct name with its formula? A) barium acetat

Question

8. Which one of the following is correct name with its formula? A) barium acetate: Ba(C2H302)2 B) sodium sulfide Na2SO3 C) iron(II) sulfate : Fe2(SO4)s D) cesium carbonate :CsCO E) barium hydroxide decahydrate Ba(O) 8hO oc 19, Calculate the number of moles of O2 required to react with phosphorus to produce 4.76 g of P406. (Assuming 100 % conversion) A) 0.0649 mol B) 0.149 mol C) 0.0216 mol D) 0.0433 mol E) 0.130 mol 20. The oxidation number of nitrogen is highest in which of the following? A) NaNO3 B) NH3 C) N2 D) HNO2

Explanation / Answer

molar mass of P4O6 = 219.9 g/mol
number of mole of P4O6 = (given mass of P4O6)/(molar mass of P4O6)
= 4.76/219.9
= 0.0216 mole

reation taking place is
P4 + 3O2 --> P4O6
according to reaction
1 mole of P4O6 required 3 mole of O2
0.0216 mole of P4O6 required (3*0.0216) mole of O2
number of mole of O2 required = 0.0648 mole
nearly equal to 0.0469 mole

Answer : option A

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