Question 1: Consider the following combustion reaction: 2C 2 H 2 (g) + 5O 2 (g)

Question

Question 1:

Consider the following combustion reaction:

2C2H2(g) + 5O2(g) 2H2O(g) + 4CO2(g)

If 1.22 g of C2H2 (MM = 26.04 g/mol) is combusted in excess oxygen at 89 °C and 1.07 atm, what volume of CO2(g) (MM = 44.01 g/mol) is created?

VCO2 = ____________ L

_______________________________________________________________________________________________

Question 2:

A 91.1 g block of an unknown metal at 63.40 °C is placed in a coffee-cup calorimeter containing 100. g of water at 27.69 °C. After equilibration, the temperature of the water is 28.94 °C.

The specific heat capacity of water is 4.18 J/g·°C.

What is the specific heat capacity of the unknown metal?

Cs = ______________ J/g·°C

Explanation / Answer

1)

mol = mass/MW = 1.22/26.04 = 0.04685 mol of fuel

then

1 mol of fuel produces 2 mol o fCO2

then 0.04685 *2 = 0.0937 mol of CO2

PV = nRT

V = nRT/P = 0.0937*0.082*(89+273)/(1.07) = 2.599 L

2)

Qmetal = -Qwater

m*Cpm*(Tf-Tm) = -m*Cpw*(Tf-Tw)

91.1*Cpm*(28.94-63.4) = -100*4.184*(28.94-27.69)

Cpm = -100*4.184*(28.94-27.69)/(91.1*((28.94-63.4))

Cp = 0.16659 J/gC

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