All categories

3 years ago

The value of h for the reaction below is -73 kj how many kj of heat are released

1 answer:

7 0

If the value of H is positive, it means you have to add that much heat to complete the reaction. If H is negative, it means that much heat is released during the chemical process. Because it is -73 kJ, 73 kJ of heat are released in the reaction.

You might be interested in

Why is it possible to use physical properties to separate a mixture

morpeh [17]

To get the exact measurement

5 0

3 years ago

Chlorine has two naturally occurring isotopes, ³⁵Cl and ³⁷Cl. What is the mass number of each isotope? How many protons, neutron

Arte-miy333 [17]

The mass number of ³⁵Cl and ³⁷Cl is 35 and respectively.

<h3>What is atomic mass? </h3>

Atomic mass is defined as the sum of number of protons and number of neutrons of an element.

Atomic mass is represented by A.

<h3>What is Atomic number?</h3>

Atomic number is defined as the number of electron in an element.

Atomic number is represented by Z.

<h3>What is Isotopes? </h3>

Isotopes are the element which have same atomic number but have different atomic mass.

Number of proton is equal to number of electrons.

Proton is positively charged, electrons are negativity charge while neutrons are neutral in nature.

Proton and neutrons are present in the nucleus of an element. On the other hand, electron revolves around the nucleus.

The atomic number of ³⁵Cl and ³⁷Cl is 17.

Number of protons = Number of electrons = 18.

Neutrons = atomic mass - atomic number

Neutrons of ³⁵Cl = 35-17 = 18

Neutrons of ³⁷Cl= 37- 17= 20

So, they have different atomic mass and number of neutrons.

Thus, we concluded that the mass number of ³⁵Cl and ³⁷Cl is 35 and 37 respectively.

learn more about atomic mass:

brainly.com/question/14250653

#SPJ4

6 0

2 years ago

PLEASE HELP ME

Dmitriy789 [7]

Hello!

The ball took up 2,9L

To solve this problem, we should apply the ideal gas law and clear for n (the number of moles), as this value doesn't change when Devin takes the ball to the garage:

$n= \frac{P1*V1}{RT1}=\frac{P2*V2}{RT2}$

Now, we should clear this equation to find V2, as this is the value we are looking for:

$V2= \frac{P1*V1*T2}{P2*T1}= \frac{400kPa*3L*250K}{350kPa*300K}=2,857L$ ≈2,9L

Have a nice day!

6 0

3 years ago

What percent of earths total volume is the crust

vlada-n [284]

Explanation:

The crust is the thinnest layer of the earth accounting for only 1% total volume of the planets.

Compositionally, the earth is divided into three layers which are the crust, mantle and the core.

The crust is the outermost layer of the earth. It rich in silicate minerals. The rocks are classified into igneous, sedimentary and metamorphic rocks.
The mantle takes up about 84% of the total volume of the earth. It is located in between the crust and the core. It is predominantly made up of ferro-magnesian silicate minerals.
The cores accounts for slightly 15% of the volume of the earth. It is the center of our geoid shaped earth. It is rich in iron and nickel metals.

Learn more:

Mantle brainly.com/question/7623608

#learnwithBrainly

7 0

3 years ago

Which type of molecule contains two atoms bonded together

solmaris [256]

simple molecules contain two atom bonded together

5 0

3 years ago

Read 2 more answers