44.) Balance the chemical equation given below, and determine the number of mole

Question

44.) Balance the chemical equation given below, and determine the number of moles of iodine that reacts with 30.0 g of aluminum

_____Al(s) + ______ I2(s) -->______Al2I6(s)

a.) 0.741 mol    b.) 1.67 mol    c.) 2.22 mol    d.) 3.33 mol

53) Thevolume of 350 mL of gas at 25 degrees C is decreased to 135 mL at constant pressure. What is the final temperature of the gas?

A) -158 degrees C    b.) 9.6 degrees C   C.) 65 degrees C    D) 500 degrees C

56) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride?

Pb(NO3)2(aq) + NaCl(aq)--> PbCl2 (s) + NaNO3(aq)

A.) 1 B.) 2 C.) 3 D.) 4 E.) 5

Explanation / Answer

(44) The answer is: b.) 1.67 mol


2 Al(s) + 3 I2 => Al2I6

Moles of Al = mass/molar mass of Al = 30.0/26.98 = 1.112 mol

Moles of I2 = 3/2 x moles of Al = 3/2 x 1.112 = 1.67 mol


(53) The answer is: A) -158 degrees C


T1/V1 = T2/V2

(273.15 + 25)/350 = T2/135

Final temperature T2 = 115 K = -158 deg C


(56) The answer is: B.) 2


The balanced equation is:

Pb(NO3)2(aq) + 2 NaCl(aq) => PbCl2 (s) + 2 NaNO3(aq)

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