A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.
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Answer:
Mole fraction SF₄: 0,121
Mole fraction CO₂: 0,879
Partial pressure SF₄: 0,134 atm
Partial pressure CO₂: 0,968 atm
Total pressure: 1,102 atm
Explanation:
The moles of sulfur tetrafluoride gas and carbon dioxide gas are:
5,29g SF₄×= <em>0,0489 moles SF₄</em>
15,6 CO₂×= <em>0,354 moles CO₂</em>
Mole fraction SF₄:
= <em>0,121</em>
Mole fraction CO₂:
= <em>0,879</em>
It is possible to obtain partial pressure of both gases with moles of each gas using:
P = nRT/V
Where n are respective moles, R is gas constant (<em>0,082atmL/molK</em>), T is teemperature (27°C=<em>300,15K</em>), V is volume (<em>9,0000L)</em>
Replacing:
Partial pressure SF₄: <em>0,134atm</em>
Partial pressure CO₂: <em>0,968atm</em>
Now, the sum of the partial pressures is the total pressure in the tank, that means:
Total pressure: 0,134atm + 0,968atm = <em>1,102atm</em>
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I hope it helps!
180.189 g was the mass of the zinc sample with a specific heat of zinc is 0.390 j/g°C.
<h3>What is specific heat capacity?</h3>The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Using specific heat capacity formula here:
×
× Δ
=
×
× Δ
0.390J/g°C × ×77.4ºC = 4.184J/g°C× 65.0g × 20.00ºC.
= 180.189 g
Hence, 180.189 g was the mass of the zinc sample.
Learn more about the specific heat capacity here:
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