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a_sh-v [17]
3 years ago
7

40.0g of NaOH is dissolved in water. How much heat (in joules) was released?

Chemistry
1 answer:
adelina 88 [10]3 years ago
4 0
<span>The molar heat of solution of NaOH is -445,100 J/mol. To compute much heat (in J) will be released if 40.00 g of NaOH are dissolved in  water, we first convert the given grams of NaOH to moles of NaOH, and use the given molar heat of solution to compute for the energy. (Using dimensional analysis):

40 g NaOH x (1 mol NaOH/ 40 g NaOH) x (-445100 J / 1 mol NaOH) = -445100 J of energy.</span>
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The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?
AlladinOne [14]

Answer:

64.52 mg.

Explanation:

The following data were obtained from the question:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Final amount (N) =.?

Next, we shall determine the rate constant (K).

This is illustrated below:

Half life (t½) = 1590 years

Rate/decay constant (K) =?

K = 0.693 / t½

K = 0.693/1590

K = 4.36×10¯⁴ / year.

Finally, we shall determine the amount that will remain after 1000 years as follow:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Rate constant = 4.36×10¯⁴ / year.

Final amount (N) =.?

Log (N₀/N) = kt/2.3

Log (100/N) = 4.36×10¯⁴ × 1000/2.3

Log (100/N) = 0.436/2.3

Log (100/N) = 0.1896

Take the antilog

100/N = antilog (0.1896)

100/N = 1.55

Cross multiply

N x 1.55 = 100

Divide both side by 1.55

N = 100/1.55

N = 64.52 mg

Therefore, the amount that remained after 1000 years is 64.52 mg

7 0
4 years ago
According to the website of the National Aeronautics and Space Administration (NASA), the average temperature of the universe is
charle [14.2K]

Answer : The temperature in degree Celsius is, -270.45^oC

Explanation :

The conversion used for the temperature from Kelvin to degree Celsius is:

^oC=K-273.15

where,

K = temperature in Kelvin

^oC = temperature in centigrade

As we are given the temperature in Kelvin is, 2.7

Now we have to determine the temperature in Kelvin.

^oC=K-273.15

^oC=2.7-273.15

^oC=-270.45

Therefore, the temperature in degree Celsius is, -270.45^oC

3 0
3 years ago
Indicate whether each of the following substances would be more soluble in H2O or C6H14:
r-ruslan [8.4K]

Answer:

H2O-a,e, C6H14 - b,c,d

Explanation:

H2O - (a) KI, e(NaC2H3O2) because they are ionic compounds

C6H14 -(b) C8H18 , (c) grease , (d) CH3(CH2)12OH because they are mostly un-polar.

4 0
3 years ago
A formula that shows how many atoms of each element a substance contains is called a(n) ____.
olganol [36]

Answer:

c

Explanation:

A formula that shows how many atoms of each element a substance contains

7 0
3 years ago
A bottle rocket experiences a 500 N force to the right and 300 N of air resistance to the left. Will it accelerate to the left,
Finger [1]
<h2>Answer 1) Right </h2><h3> Explanation :  </h3>

To find that the acceleration will be on right or left, we need to find the net force between them.


Which is Net F = 500 N - 300 N = 200 N  


Therefore, the acceleration will be on right side as it has greater difference as compared to left.



<h2>Answer 2) Left </h2><h3> Explanation : </h3>

Here, the right side will have 2 forces of 8 N which gives the total of 16 N.  

Using the net force calculation = 20 N - 16 N = 4 N.


Therefore, the box will accelerate towards left-side.



<h2>Answer 3) Right </h2><h3>Explanation : </h3>

In this case, the car is experiencing +300 N to the right and -150 N on left.


On calculating the net force = +300 N- 150 N = +150 N.


Here, right side has 150 N greater force than left side. Therefore, the car will accelerate towards right.



<h2>Answer 4) Right </h2><h3>Explanation : </h3>

The rope will move towards right as the net force will be 10 N towards right.


By calculating the net force = 410 N - 400 N = 10 N.


This clearly indicates that the rope will move towards right.



<h2>Answer 5) Right </h2><h3>Explanation: </h3>

The skateboard will accelerate towards right as the force will be 10 N more on right than on left.


As the net force will be = 100 N - 90 N = 10 N.


Since, the 10 N more force is on right the acceleration will be on right.



<h2>Answer 6) Left </h2><h3>Explanation : </h3>

The box will experience acceleration towards left as there will be greater 1 N force on left as compared to right.


On calculating the net force = 20 N - 19 N = 1 N


This shows that the box will accelerate on left side.

4 0
4 years ago
Read 2 more answers
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