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3 years ago

Ethyne (C2 H2 (g), Hf = 226.77 kJ/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide

Chemistry

1 answer:

den301095 [7]3 years ago

8 0

C₂H₂ + O₂ --> CO₂ + H₂O

when balanced

2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

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If it takes 43.2 mL of 0.1 M NaOH to neutralize a 50 mL HCl solution, how many moles of NaOH were added to the HCl solution?

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4 years ago

When ironing clothes the primary method of heat transfer is conduction convection insulation or radiation

Hatshy [7]

Conduction, because there is a direct transfer of heat.

When the iron touches the fabric, the heat from the iron gets transferred to the fabric and this is why it is a conduction type of heat transfer.

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3 years ago

What mass of calcium hydroxide is formed when 10.0g of calcium oxide reacts with 10.0g of water?

nexus9112 [7]

The mass of calcium hydroxide that is formed when 10.0 g of CaO reacts with 10.0 g of water is 13.024 grams

calculation

from the equation

CaO + H2O → Ca(OH)2,

1 moles of CaO reacted with 1 moles of H2O to form 1 moles of Ca(OH)2

find the moles of each reactant

moles=mass/molar mass

moles of CaO= 10 g/56 g/mol=0.179 moles

moles of H2O = 10 g/18 g/mol 0.556 moles

CaO is the limiting reagent therefore by use of mole ratio of CaO:Ca(OH)2 which is 1:1 moles of Ca(OH)2 is = 0.179 moles

mass= moles x molar mass

= 0.176 moles x 74 g/mol = 13.024 grams

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4 years ago

Which of the following phase changes only occurs in solids possessing vapor pressures above atmospheric pressure and at ambient

GuDViN [60]

Answer: The phase change process in which solids gets converted to gases is sublimation.

Explanation:

For the given options:

Option a: Condensation

It is a type of process in which phase change occurs from gaseous state to liquid state at constant temperature.

$Gas\rightleftharpoons Liquid$

Option b: Melting

It is a type of process in which phase change occurs from solid state to liquid state at constant temperature.

$Solid\rightleftharpoons Liquid$

Option c: Sublimation

It is a type of process in which phase change occurs from solid state to gaseous state without passing through the liquid state at constant temperature.

$Solid\rightleftharpoons Gas$

Option d: Deposition

It is a type of process in which phase change occurs from gaseous state to solid state without passing through the liquid state at constant temperature.

$Gas\rightleftharpoons Solid$

Hence, the phase change process in which solids gets converted to gases is sublimation.

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3 years ago

What does contact forces and non-contact forces mean?

Dmitrij [34]

A contact force is a force in which and object comes in contact with a another object. A non-contact force, is a force is an object applied by another body. (A good example of a non-contact force is gravity)

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3 years ago