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Aliun [14]
3 years ago
8

Scientific Method – Design Your Own Experiment

Chemistry
1 answer:
Varvara68 [4.7K]3 years ago
6 0

Answer:

not a question but i need points yolo

Explanation:

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22.99 on the element sodium means the combined numbers of electrons and protons?
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What expression approximates the volume of O2 consumed, measure at STP, when 55 g of Al reacts completely with excess O2?2 Al(s)
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Answer:

34.28 L ( 1.5*22.4 L)

Explanation:

Calculation of the moles of aluminum as:-

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The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

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Moles= 2.0384\ mol

According to the reaction:-

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4 moles of aluminum react with 3 moles of oxygen gas

1 mole of aluminum react with \frac{3}{4} moles of oxygen gas

2.0384 moles of aluminum react with \frac{3}{4}\times 2.0384 moles of oxygen gas

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At STP,  

Pressure = 1 atm  

Temperature = 273.15 K

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PV=nRT

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P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

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1 atm × V = 1.5288 mol × 0.0821 L.atm/K.mol × 273.15 K

⇒V = 34.28 L ( 1.5*22.4 L)

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