In which block of the periodic table is uranium (U) found?

According to ideal gas law, there are 0.00565 number  of moles of hydrogen present in the gas sample .

What is ideal gas law?

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.Ideal gas law was proposed by Benoit Paul Emile Clapeyron in year 1834.It is a thermodynamic equation which has wide applications.

Gases which obey ideal gas law are difficult to exist.

Substituting the values as, P=1.5 atmospheres, V=8.56 L, R=8.314 ,T=0°C=273 K that is , n=PV/RT=1.5×8.56/8.314×273=0.00565 moles.

Thus, there are 0.00565 moles of hydrogen present in the gas sample .

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Answer:

The % yield of the reaction is 73.8 %

Explanation:

To solve this, we list out the given variables thus

Mass of aluminium in the experiment = 2.5 g

mass of oxygen gas in the experiment = 2.5 g

Molar mass of aluminium = 26.98 g/mol

molar mass of oxygen O₂ = 32 g/mol

The reaction between aluminium and gaseous oxygen can be written as follows

4Al + 3O₂ → 2Al₂O₃

Thus four moles of aluminium forms two moles of aluminium oxide

Thus (2.5 g)÷(26.98 g/mol) = 0.093 mole of aluminium and

(2.5 g)÷(32 g/mol)  = 0.078125  moles of oxygen

However four moles of aluminium react with three moles of oxygen gas O₂

1  mole of aluminum will react with 3/4 moles of oxygen O₂ and 0.093 mole of aluminium will react with 0.093*3/4 moles of O₂ = 0.0695 moles of Oxygen hence aluminium is the limiting reagent and we have

1 mole of oxygen will react with 4/3 mole of aluminium

∴ 0.078125 mole of oxygen will react with 0.104 moles of aluminium

Therefore 0.093 mole of aluminium will react with O₂ to produce 2/4×0.093 or 0.0465 moles of  2Al₂O₃

The molar mass of 2Al₂O₃ = 101.96 g/mol

Hence the mass of 0.0465 moles = number of moles × (molar mass)

= 0.0465 moles × 101.96 g/mol = 4.74 g

The  of aluminium oxide Al₂O₃ is 4.74 g, but the actual yield = 3.5 g

Therefore the Percentage yield = ×100 = × 100 = 73.8 % yield

The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers. It is 67.3 kilometers apart.

What is distance ?

Distance is a measurement of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.

The size or extent of the displacement between two points is referred to as distance. Keep in mind that the distance between two points and the distance traveled between them are not the same. The length of the entire journey taken to get from one point to another is the distance traveled.

Both of these numbers are quite close to the recognized modern estimates for the Earth's diameter and radius, which have since been determined by orbiting spacecraft and are 40,070 km and 6378 km, respectively.

Thus, The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers.

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