210.0 °C a gas has a volume of 8.00 L. What is the volume of this gas at -23.0°C?

Answers

Answer 1

Answer: V₁ = 8.00 L

T₁ = 210.0ºC + 273 = 483 K

V₂ = ?

T₂ = - 23.0ºC + 273 = 250 K

V₁/ T₁ = V₂ / T₂

8.00 / 483 = V₂ / 250

483 x V₂ = 8.00 x 250

483 V₂ = 2000

V₂ = 2000 / 483

V₂ = 4.14 L

hope this helps!

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If each fission reaction in a nuclear reactor emits three neutrons, how many neutrons are produced from three fission reactions? one
three
six
nine

Answers

Answer : The correct option is, Nine.

Explanation :

Nuclear fission : It is defined as the splitting of bigger nuclei into two smaller nuclei. During this process neutrons and some energy also released.

In nuclear reactor, neutron hits the uranium nucleus, the uranium nucleus splits into two nuclei and three neutrons. These three neutrons further hit the uranium nucleus and the uranium nucleus split into two nuclei and these 3 neutrons produces 9 neutrons.

The reaction for nuclear fission is,

$^(235)_(92)U+^1_0n\rightarrow ^(89)_(36)Kr+^(144)_(56)Ba+3^1_0n$

As, Each nuclear fission reaction produces 3 neutrons

So, three nuclear fission reaction produces 9 neutrons

If each fission reaction in a nuclear reactor emits three neutrons, 9 neutrons are produced from three fission reactions. The correct option is option D.

What is nuclear reactor?

A nuclear reactor comprises a device used to start and regulate nuclear chain reactions involving fission or nuclear fusion. Nuclear power plants employ nuclear reactors to produce energy, and they are also used in nuclear propulsion for ships. Nuclear fission transfers heat into a working fluid (such as water or gas), which then drives steam turbines.

In nuclear reactor, neutron hits the uranium nucleus, the uranium nucleus splits into two nuclei and three neutrons. These three neutrons further hit the uranium nucleus and the uranium nucleus split into two nuclei and these 3 neutrons produces 9 neutrons.

Therefore, the number of neutron is 9. The correct option is option D.

To know more about nuclear reactor, here:

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An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent and daughter concentrations (in percentages) and what is its age?

Answers

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is $3.32* 10^9\text{ years}$

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

$\text{Parent concentrations}=(1.8g)/(3g)* 100=60\%$

and,

$\text{Daughter concentrations}=((3-1.8)g)/(3g)* 100=40\%$

As we know that, the half-life of uranium-238 = $4.5* 10^9$ years

Now we have to calculate the rate constant, we use the formula :

$k=(0.693)/(t_(1/2))$

$k=\frac{0.693}{4.5* 10^9\text{ years}}$

$k=1.54* 10^(-10)\text{ years}^(-1)$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=(2.303)/(k)\log(a)/(a-x)$

where,

k = rate constant = $1.54* 10^(-10)\text{ years}^(-1)$

t = time passed by the sample = ?

a = initial amount of the reactant = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

$t=(2.303)/(1.54* 10^(-10))\log(3)/(1.8)$

$t=3.32* 10^9\text{ years}$

Therefore, the age of rock is $3.32* 10^9\text{ years}$

Which of the following statements is true about chemical reactions? endothermic reactions absorb heat and exothermic reactions give off heat

exothermic reactions absorb heat and endothermic reactions give off heat

endothermic and exothermic reactions absorb heat

endothermic and exothermic reactions give off heat

Answers

Endothermic reactions absorb heat and exothermic reactions give off heat

Calculate the mass percent composition of sulfur in Al2(SO4)3.

Answers

The molar mass of aluminum sulftae is 342.14 g/mol.

Since the subscript shows that there are 3 sulfurs within the substance, the total mass of sulfur is 96.21g/mol

Now take the mass of the sulfur and divide it by the molar mass of aluminum sulfate, then multiply by 100:
(96.21/342.15)(100) = 28.1% mass composition of sulfate

3 x 1 US cup volume in millilitres (mL

Answers

Answer:

3 US Cups = 720 ml.

Explanation:

Officially, a US Cup is 240ml (or 8.45 imperial fluid ounces.)
3 x 1 US Cup = 3 US Cups
1 US Cup = 240 ml.
∴ 3 US Cups = 3 x 240ml
= 720 ml.

The figure shows a nutrition label. How much energy does this food contain?

Answers

Answer:

i need help with that too.

Explanation:

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