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1 year ago

A sample of carbon monoxide and oxygen gasses are

Chemistry

1 answer:

otez555 [7]1 year ago

3 0

Answer:

.0172 mole of CO2

Explanation:

PV = nR T n = number of moles V = .5 liter

R = gas constant = .082057 L atm/(k mole)

T needs to be in Kelvin = C + 273.15

.868 * .5 = n * .082057 * ( 35 + 273.15)

n = .0172 moles

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KNO3(s) --> K+(aq) + NO3-(aq)

ella [17]

Answer:

KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)

Explanation:

In the reaction:

KNO₃(s) → K⁺(aq) + NO₃⁻(aq)

The heat absorbed for the reaction (Because the temperature decreases) is:

Q = C×m×ΔT

Where C is specific heat (4,18J/g°C); m is mass (100g); ΔT is (30,0°C-21,6°C = 8,4°C)

Replacing:

Q = 4,18J/g°C×100g×8,4°C

Q = 3511 J

Now, moles of KNO₃ are:

10,1g×(1mol / 101g) = 0,1 moles.

Heat of solution in kJ/mol is:

3,511 J / 0,1 mol = 35,1 kJ

As the heat was absorbed for the reaction, right answer is:

KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)

That means the reaction needs the heat to occurs.

I hope it helps!

6 0

2 years ago

What is the volume of 70.0 g of ether if density os 0.70 g/mL

sdas [7]

$D = m / V$

$0.70 g/mL = \frac{70.0g}{V}$

$V = \frac{m}{D}$

$V = \frac{70.0g}{0.70g/mL}$

$V = 100 mL$

hope this helps!

3 0

3 years ago

Give the reason for the evaporation of the solution to dryness with 6 m hcl in the first procedure of the copper-arsenic group a

SCORPION-xisa [38]

Evaporation occurred between the reaction of the hydrochloric acid and the arsenic group because there is a formation of gas. A liquid is cooled if condensation exceeds evaporation. This is because the cooling of the liquid decreases the kinetic energy of the molecules. Their movement is being restricted by the colder temperature. The molecules tend to be closer with each other. Also, because of their restricted movement, the liquid may turn into solid due the colder temperature. An example of this is the cooling of liquid water by placing it into the refrigerator into solid water (ice).

4 0

2 years ago

The compound, nah2po4, is present in many baking powders. what is its name? sodium phosphate sodium bephosphate sodium dihydroge

AlladinOne [14]

The compound NaH2PO4 name is

sodium dihydrogen phosphate

Explanation
This name is arrived at by using the IUPAC rules of naming compound

1. the metal (sodium)is named first followed by the ligand ( hydrogen and phosphate)

Ligand are molecules that are attached to the metal center.

2. ligand are named using alphabetical order(for our case h for hydrogen come before p for phosphate hence hydrogen is named first)

3. Prefix di is used since hydrogen are two

hence the name of the compound is Sodium dihydrogen phosphate

8 0

2 years ago

Which of the following correctly represents the transmutation in which a curium-242 nucleus is bombarded with an alpha particle

Alekssandra [29.7K]

Answer: The chemical equation is written below.

Explanation:

Transmutation is defined as the process in which one chemical isotope gets converted to another chemical isotope. The number of protons or neutrons in the isotope gets changed.

The chemical equation for the reaction of curium-242 nucleus with alpha particle (helium nucleus) follows:

$_{96}^{242}\textrm{Cm}+_4^2\textrm{He}\rightarrow _{98}^{245}\textrm{Cf}+_0^1\textrm{n}$

The product formed in the nuclear reaction are californium-245 nucleus and a neutron particle.

6 0

3 years ago