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kenny6666 [7]
3 years ago
12

An engine is running by burning coal. Which statement is correct?

Chemistry
1 answer:
timama [110]3 years ago
5 0
C is the answer hove a great day
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How much heat energy is needed to heat 250 g of water from 200C to its boiling point and then completely vaporize it?
alexandr1967 [171]

Answer: 40.66kJ/mol.

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Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at

Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at 100

Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at 100∘

Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at 100∘C

Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at 100∘C .

Explanation:Assuming that pressure is equal to 1 atm , boiling water at its boiling point implies providing it with enough heat to turn it from liquid at 100∘C to vapor at 100∘C .The amount of heat needed to allow one mole of water to undergo this phase change is called the enthalpy change of vaporization,

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nge of vaporization, ΔHvap .For water at 100∘C , the enthalpy change of vaporization is equal toΔHvap=40.66 kJ/mol

8 0
3 years ago
A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight
Rama09 [41]
Correct Answer: Option a. 6150.64 N

Weight (w) is defined as:

w = mg

So, first we need to find the mass (m) of the steel block using its volume and density.

Mass = Density x Volume 
So,
m = 0.08 x 7840 = 627.2 g

Using value of m and g = 9.807, we get

w = 627.2 x 9.807 = 6150.95 Newtons

Therefore, option a is the correct answer. 
The slight difference is because the value of g is rounded of to 3 decimal cases. 
6 0
3 years ago
Need this ASAP so hury up​
Genrish500 [490]

Answer:

The type of bonding found in sodium chloride is called ionic bonding.

Explanation:

Ionic bonding is the attraction between two atoms with opposite charges.  In sodium chloride, sodium has a positive charge and chlorine has a negative charge; therefore, they attract one another and form a bond.

6 0
3 years ago
The K sp for barium fluoride, BaF2, is 2.45 × 10-5. What is the molar solubility of barium fluoride?
lilavasa [31]

Answer: The molar solubility of barium fluoride is 0.0183 moles/liter.

Explanation:

The equation for the reaction will be as follows:

BaF_2\rightarrow Ba^{2+}+2F^

By Stoichiometry,

1 mole of BaF_2 gives 2 moles of F^- and 1 mole of Ba^{2+}

Thus if solubility of BaF_2 is s moles/liter, solubility of Ba^{2+} is s moles/liter and solubility of F^- is 2s moles/liter

Therefore,  

K_sp=[Ba^{2+}][F^{-}]^2

2.45\times 10^{-5}=[s][2s]^2

4s^3=2.45\times 10^{-5}

s^3=6.12\times 10^{-6}moles/liter

s=0.0183moles/liter

Thus the molar solubility of barium fluoride is 0.0183 moles/liter.

8 0
3 years ago
Explain how the answer is 4 please
Akimi4 [234]
The image is not loading are you sure you uploaded something
4 0
3 years ago
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