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IrinaVladis [17]
2 years ago
7

nitial mass of water, at its boiling point, is 0.8 kg. 4 kW of heater is used to boil it completely. Assuming the specific laten

t heat of vaporization of water is 2MJ/kg, what is the time taken to vaporize all the water
Chemistry
1 answer:
asambeis [7]2 years ago
6 0

The  time taken to vaporize all the water is 400 seconds.

<h3>Total heat required to vaporize the water</h3>

The total heat required to vaporize the water is calculated as follows;

E = Lm

where;

  • L is latent heat of vaporization of water
  • m is mass of water

E  = 2 x 10⁶ J/kg x 0.8 kg

E = 1,600,000 J

<h3>Time taken to vaporize all the water</h3>

The time taken to vaporize all the water is calculated as follows;

E = power x time

time = E/power

time = ( 1,600,000 J) / (4,000 J/s)

time = 400 seconds

Thus, the  time taken to vaporize all the water is 400 seconds.

Learn more about heat of vaporization of water here: brainly.com/question/26306578

#SPJ1

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Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C pre
Ahat [919]

Answer: The age of the tool is 15539 years

Explanation:

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

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant = 100

a - x = amount left after decay process = \frac{15.5}{100}\times 100=15.5  

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.  

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{5730yr}=0.00012yr^{-1}

b) for 15.5 % of original amount

t=\frac{2.303}{0.00012}\log\frac{100}{15.5}

t=15539years

Thus age of the tool is 15539 years

8 0
3 years ago
What is the force needed to accelerate a sled with a mass of 2 kg at a rate of 3.0/s²
frutty [35]

Answer:

<h3>The answer is option A</h3>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

<h3>Force = mass × acceleration</h3>

From the question

mass = 2 kg

acceleration = 3 m/s²

We have

Force = 2 × 3

We have the final answer as

<h3>6.0 N</h3>

Hope this helps you

7 0
3 years ago
Carpet and tile flooring are at the same room temperature,
monitta

Answer:

Depends on conduction and the texture

Explanation:

it feels softer because tile is expose to the coldness in your building and carpet feels warmer because the texture of it

8 0
3 years ago
What do the parentheses mean in a chemical reaction and how they are used
galben [10]

Parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.

<u>Explanation:</u>

In a chemical reaction, sometimes, a compound may be composed of group of polyatomic ions with other ions. Some of the polyatomic ions are sulfate, carbonate, nitrate, hydroxide, bicarbonate, ammonia etc.

So these polyatomic ions are formed by combining two or more elements. Thus, if the number of polyatomic ions in a compound is more than one, then we use parathesis and write those polyatomic ions in it and write the number of polyatomic ions present in the compound as subscript of the parathesis.

For example, Fe₂(SO₄)₃

So here SO₄ is a polyatomic ion and in the compound 3 atoms of SO₄ is required to neutralize the compound and thus paranthesis is used. Thus, parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.

5 0
3 years ago
In which medium does sound travel the slowest?
ZanzabumX [31]
Sound actually travels slower in air.This is because sound is kinetic energy and has to pass from molecule to molecule.In gas the molecules are farther apart taking more time for it to pass,in water the molecules are closer so it takes less time for the sound to get from one molecule to another and with cast iron (since it's very dense) the molecules are very close allowing sound to travel quickly with ease.
5 0
3 years ago
Read 2 more answers
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