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3 years ago

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You apply 100.0 of force to a machine. The machine applies 20.0 N of force to the load. What is the mechanical advantage of the

machine.

1 answer:

rjkz [21]3 years ago

5 0

MA= output force/input force
MA= 100N/20N
MA= 50

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Nitrogen dioxide is used industrially to produce nitric acid, but it contributes to acid rain and photochemical smog. What volum

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The reaction of nitric acid with copper is:

Cu(s) + 4HNO₃ → Cu(NO₃)₂ + 2NO₂(g) + 2H₂O(l)

Moles of copper are: 4.95cm3 X8.95gmX1mol / 63.55gmX1mol

=0.697moles

Moles of nitric acid are: 230mlX 1.42gm X68gmX1mol / 63.01gmX100gm

=3.52moles

As 1 mol of Cu reacts with 4 moles of HNO₃

=0.697 mol Cu × (4mol HNO₃ / 1mol Cu) = 2.79 moles of HNO₃ will react. That means Cu is limiting reactant.

Moles of NO₂ produced are:

0.697 mol Cu × (2mol NO₂ / 1mol Cu) = 1.394 moles of NO₂

Using PV = nRT

Where P is pressure (735torr / 760 = 0.967atm) ; n are moles (1.394mol);

R is gas constant (0.082atmL/molK); T is temperature (28.2°C + 273.15 = 301.35K).

Thus, volume is:V = nRT / P

V = 1.394mol×0.082atmL/molK×301.35K / 0.967atm

V = 35.6L

The volume of nitrogen oxide formed is 35.6L

To know more about nitrogen dioxide here

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2 years ago

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irinina [24]

Answer: true

Explan Which statement about quantum numbers is NOT correct?a Two or more electrons in an atom canhave the same set of quantum numbers.Quantum numbers describe the orbitals of an atom.сQuantum numbers describe the locationof each electron in an atom.dQuantum numbers describe the energy of each electron in an atom.

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What Mendel called factors are now called

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They are now called genes.

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Be sure to answer all parts. Write an unbalanced equation to represent each of the following reactions: Do not include phase abb

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<u>Answer:</u> The unbalanced chemical equations are written below.

<u>Explanation:</u>

An unbalanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is not equal to the total number of individual atoms on the product side. These equations does not follow law of conservation of mass.

<u>For a:</u>

The chemical equation for the reaction of nitrogen gas and oxygen gas follows:

$N_2+O_2\rightarrow NO_2$

The product formed is nitrogen dioxide.

<u>For b:</u>

The chemical equation for the decomposition of dinitrogen pentaoxide follows:

$N_2O_5\rightarrow N_2O_4+O_2$

The product formed is dinitrogen tetroxide and oxygen gas.

<u>For c:</u>

The chemical equation for the reaction of ozone to oxygen gas follows:

$O_3\rightarrow O_2$

The product formed is oxygen gas.

<u>For d:</u>

The chemical equation for the reaction of chlorine and sodium iodide follows:

$Cl_2+NaI\rightarrow NaCl+I_2$

The product formed is sodium chloride and iodine gas

<u>For e:</u>

The chemical equation for the reaction of magnesium and oxygen gas follows:

$Mg+O_2\rightarrow MgO$

The product formed is magnesium oxide

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3 years ago