A salt is dissolved in water, which has a boiling point of 100 degrees celsius. the boiling point of the solution would be?

Answers

Answer 1

Answer: It would be higher, due to lower vapor pressure when salt is added. If you want an exact number, we're going to need to know how much salt.

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When fossil fuels are burned, _____ is released into the atmosphere.A. oxygen
B. nitrogen
C. ammonia
D. carbon dioxide

Answers

Carbon dioxide. This is because when fossil fuels are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). These reactions release heat that we use for energy. For example, for the same amount of energy produced, burning natural gas produces about half of the amount of CO2 produced by burning coal.

Final answer:

The burning of fossil fuels primarily releases carbon dioxide into the atmosphere, contributing to greenhouse gas emissions and global warming.

Explanation:

When fossil fuels are burned, carbon dioxide (CO₂) is predominantly released into the atmosphere. Fossil fuels, such as coal, oil, and natural gas, are composed mainly of carbon. During combustion, this carbon combines with oxygen in the air to form carbon dioxide. This process is a significant source of greenhouse gases, contributing heavily to global warming. It's important to note that other substances like water vapor and minor amounts of sulfur oxides can also be produced in this reaction, but the main product is carbon dioxide.

Learn more about Burning of Fossil Fuels here:

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If you have respiratory or heart problems, _____ can make it worse. carbon monoxide oxygen nitrogen sulfur oxide nitrogen oxide

Answers

If you have respiratory or heart problems, carbon monoxide can make it worse. This is because carbon monoxide is soluble in water and our body consists mostly of water. It can be toxic when dissolved in large amounts.

What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?

Answers

First you need to find the balanced chemical formula.
CuCl₂+2NaNO₃→2NaCl+Cu(NO₃)₂

Then you can find out how much NaCl 31.0g of CuCl₂ should produce using stoichiometry. Divide 31.0g by the molar mass of CuCl₂ (134.446g/mol) to get 0.2306mol CuCl₂. Than multiply 0.2306mol CuCl₂ by 2 to get 0.4612mol NaCl. Than multiply 0.4612mol by the molar mass of NaCl (58.45g/mol) to get 26.95g of NaCl.
that means that 100% yield would give you 26.95g of NaCl so to find percent yield divide 21.2 by 26.95 to get 0.7867 which is 78.7% yield

Therefore the answer is 78.7% yield.
I hope this helps. Let me know if anything is unclear

Nuclear Forcesin determining nuclear binding energy, what is Einstein's equation used to do?A)convert energy to mass
B)convert joules per nucleus to joules per mole of nuclei
C)convert mass to tons
D)convert mass to energy

Answers

Answer:

Explanation:

Einstein's equation E = m * c2, allows to determine the energy.

How to determine nuclear binding energy? To achieve it, the mass of the nucleons it is combined and transformed into energy, at the end of the process there is less mass in the system than there was before combining and converting into energy.

A and D mean the same thing but i believe the answer your looking for is D

At STP, which of these substances is most soluble in H2O?(1) CCl4 (3) HCl
(2) CO2 (4) N2

Answers

The correct answer is option 3. Hydrochloric acid is the most soluble in water at standard temperature and pressure because it is has a polar covalent bond which makes it a polar molecule. Water is also a polar substance therefore hydrochloric acid will really be soluble in water.

Answer: Option (3) is the correct answer.

Explanation:

It is known that like dissolves like that is, a polar solvent will dissolve only polar compounds. Whereas a non-polar solvent will dissolve only non-polar compound.

Substances whose atoms have large difference in electronegativities are polar in nature. Water is a polar solvent and it is able to dissolve polar molecules.

For example, HCl is a polar or ionic compound so it is soluble in water.

On the other hand, $CCl_(4)$ , $CO_(2)$ , and $N_(2)$ are all non-polar as bond between them is formed due to sharing of electrons.

Hence, we can conclude that at STP, HCl is the substance that is most soluble in $H_(2)O$ .

How many joules are needed to warm 45.0 grams of water from 30.0 degrees C to 75.0 degrees C?

Answers

Answer : The amount of heat needed are, 8464.5 J

Explanation :

Formula used :

$q=m* c* (T_(final)-T_(initial))$

where,

q = heat gained = ?

m = mass of water = 45.0 g

c = specific heat of water = $4.18J/g^oC$

$T_(final)$ = final temperature = $75.0^oC$

$T_(initial)$ = initial temperature = $30.0^oC$

Now put all the given values in the above formula, we get:

$q=45.0g* 4.18J/g^oC* (75.0-30.0)^oC$

$q=8464.5J$

Thus, the amount of heat needed are, 8464.5 J

q=m x Cp x ∆T

m is the mass of the water, Cp is the specific heat of water and ∆T is the change in temperature of the water (final-initial temperature). q is the energy involved in the reaction, measured in joules.

q=(45.0) x (4.184 Jg^-1/°C^-1) x (45°C)
q=8472.6 Joules

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