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3 years ago

The phase change in which a substance changes from a gas directly to a solid is

1 answer:

6 0

It is called deposition.
Bcoz,
Sublimation - transformation from solid to gas,
Condensation - gas to liquid transformation
Vaporization - liquid to gas transformation

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Công thức toingr quát anken

Maksim231197 [3]

Answer:

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Explanation:

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3 years ago

Propane burns in oxygen to produce carbon dioxide and steam. The unbalanced equation for this reaction is: C3H8 + O2 → CO2 + H2O

NemiM [27]

Here is your answer

C3H8 + O2-----> CO2 + H2O

Balancing C atoms

C3H8 + O2------> 3CO2 + H2O

Balancing H atoms

C3H8 + O2------> 3CO2 + 4H2O

Balancing O atoms

C3H8 + $\bold{5}$ O2-------> $\bold{3}$ CO2 + $\bold{4}$ H2O

Hence the equation is balanced.

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3 years ago

What evidence of climate change

kobusy [5.1K]

Global temperature rising, warming oceans, shrinking ice sheets, sea levels rise

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4 years ago

In an oxidation-reduction reaction, the number of electrons lost is

antoniya [11.8K]

<u>(1) equal to the number of electrons gained</u>
(2) equal to the number of protons gained
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<span>(4) less than the number or protons gained</span>

4 0

3 years ago

A sample of oxygen gas is collected over water at 25°C and a total pressure of 644 torr. The volume of the gas collected is 500.

Mumz [18]

Answer:

0.544g

Explanation:

To calculate the mass of oxygen collected, we can calculate the number of moles of oxygen collected and multiply this by the molar mass of the oxygen molecule.

To calculate the number of moles of oxygen collected, we can use the ideal gas equation I.e PV = nRT

Rearranging the equation, n =PV/RT

We now identify each of the terms below before substituting and calculating.

n = number of moles, which we are calculating.

R = molar gas constant = 62.64 L.Torr. K^-1. mol^-1

V = volume = 500ml : 1000ml ÷ 1L, hence , 500ml = 500/1000 = 0.5L

T = temperature = 25 degrees Celsius = 273 + 25 = 298K

P = pressure. But since the gas was collected over water, we subtract the vapour pressure of water from the total pressure = 644 - 23.8 =620.2 torr

We substitute these values into the equation to yield the following:

n = (620.2× 0.5) ÷ ( 62.64 × 298)

n = apprx 0.017 moles

To calculate the mass of oxygen collected, we need the molar mass of oxygen. The molecular formula of oxygen is O2, atomic mass of oxygen= 32g/mol

Thus the mass of oxygen collected = 0.017 mole × 32g/mol = 0.544g

8 0

4 years ago