Arrange He,Br2 and NaCl in increasing boiling point and explain why

f 65mL of sulfuric acid and 25mL of sodium hydroxide were mixed and the solution had a density of 1.01g/mL, what is the heat of

user100 [1]

The question is incomplete, here is the complete question:

If 65 mL of sulfuric acid and 25 mL of sodium hydroxide were mixed and the solution had a density of 1.01 g/mL, What is the heat of the calorimeter in kJ given the temperature change of the above equation is -5.5 K. You may assume the solution has a heat capacity of 4.180 J/gK. Express your final answer in kJ and with 2 decimal places

<u>Answer:</u> The heat of the calorimeter is 2.09 kJ

<u>Explanation:</u>

To calculate the mass of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of solution = 1.01 g/mL

Volume of solution = [65 + 25] mL = 90 mL

Putting values in above equation, we get:

$1.01g/mL=\frac{\text{Mass of solution}}{90mL}\\\\\text{Mass of solution}=(1.01g/mL\times 90mL)=90.9g$

To calculate the heat released by the reaction, we use the equation:

$q=mc\Delta T$

where,

q = heat released

m = mass of solution = 90.9 g

c = heat capacity of solution = 4.180 J/g.K

$\Delta T$ = change in temperature = -5.5 K

Putting values in above equation, we get:

$q=90.9g\times 4.180J/g.K\times (-5.5K)=-2089.8J=-2.09kJ$

Heat released by the solution will be equal to the heat absorbed by the calorimeter.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

Heat absorbed by the calorimeter = -(-2.09) = 2.09 kJ

Hence, the heat of the calorimeter is 2.09 kJ

8 0

4 years ago

How many ions are present in 9.4g of pottasium oxide K2O? (K=39 ,O=16) (Avogadros constant=6.0*10^23/mol)

elena-14-01-66 [18.8K]

1) k2O = 2K(1+) + O(2-)

This is, every molecule of K2O consists of three ions (2 of K 1+, and one of O 2-)

2) Caluclate the number of moles of K2O

- molar mass of K2O = 2*39 + 16 = 94 g/mol
- n = mass / molar-mass = 9.4g / 94 g/mol = 0.1 mol

3) Multiply by 3 to have the number of moles of ions: 3 *0.1 mol = 0.3 mol of ions.

4) Multiply by Avogadro's number to obtain the number of ions"

0.3 mol * 6.0*10^23 =1.8 * 10^23 ions.

Answer: 1.8*10^23 ions

6 0

4 years ago

How much heat is required to raise the temperature of 67.0 g of water from its melting point to its boiling point?

vodka [1.7K]

When 67 g of water is heated from its melting point to its boiling point, it takes 28006 J of heat.

<h2>Relationship between heat production and temperature change</h2>

A way to numerically relate the quantity of thermal energy acquired (or lost) by a sample of any substance to that sample's mass and the temperature change that results from that is provided by specific heat capacity.

The following formula is frequently used to describe the connection between these four values.

q = msΔT

where, q = the amount of heat emitted or absorbed by the thing

m = the object's mass = 67 gm

s = a specific heat capacity of the substance = 4.18 J/gC

ΔT = the resultant change in the object's temperature = 373.15 -273.15K= 100 k

q = 67 * 4.18 * 100 J

⇒q = 28006 J

Therefore it is concluded that 67 g of water takes 28006 J of heat from its melting point to reach its boiling point.

Learn more about thermal energy here:

brainly.com/question/3022807

#SPJ1

3 0

3 years ago

If one parent is TT (tall), and the other parent is tt (short). What percentage of the offspring will be short

Llana [10]

Answer:

The answer is B (25%)

Explanation:

I think the answer is this because it's the smallest value in the options, and if you choose 0% the answer would be wrong.

8 0

4 years ago

Which of the following describes an example of the atmosphere acting as a system?

marissa [1.9K]

Answer:

its lavered structure

Explanation:

4 0

4 years ago