of which hydrocarbon requires 8 mol O_2 to achieve complete combustion to give c
ID: 1069927 • Letter: O
Question
of which hydrocarbon requires 8 mol O_2 to achieve complete combustion to give carbon dioxide and water? C_3H_8 C_4H_10 C_5H_10 C_5H_12 What is the concentration of calcium ions in 350. mL of an aqueous solution containing 7.50 g CaCl_2? 0.0676 M 0.193 M 0.284 M 0.535 M 0.422 g of an element Z reacts with oxygen to form 0.797 g of the oxide Z_2O_3, what is the element Z? Al Sc Cr Ga At constant temperature and pressure, 5.0 L of SO_2 is combined with 3.0 L of O_2 according to the equation: 2 SO_2(g) + O_2(g) rightarrow 2 SO_3(g) After SO_3 formation is complete, what is the volume of the mixture? 5.5 L 6.0 L 6.5 L 8.0 L A sample of 0.040 mol hypochlorite ion is treated with varying amounts of 1.0 M aqueous H_2O_2. Which graph represents the amount of O_2(g) that is evolved according to the chemical reaction shown? OCl^-(aq) + H_2O_2(aq) rightarrow Cl^-(aq) + H_2O(l) + O_2(g)Explanation / Answer
(3)
4 Z (s) + 3 O2 (g) --------------> 2 Z2O3 (g)
First let us assume it is as Al,
Moles of Al = 0.422 / 27 = 0.0156 mol
from the above balanced equation,
4 mol Al = 2 mol Al2O3
then, for 0.0156 mol Al = 2*0.0156 / 4 = 0.0078 mol Al2O3
Therefore, Mass of Al2O3 = 0.0078 * 102 = 0.797 g.
So, it is equal to the given mass of Z2O3.
Therefore, the metal is (a) Al
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