Which sentences describe describe disadvantages of burning fossil fuel?

How much heat is released when 27.6 g P C l subscript 3 cools from 83.1 °C to 55.6 °C? (The specific heat of P C l subscript 3 i

Paul [167]

Answer: Thus 663 J of heat is released when 27.6 g $PCl_3$ cools from 83.1 °C to 55.6 °C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

$Q=m\times c\times \Delta T$

Q = Heat released = ?

m = mass of substance = 27.6 g

C = specific heat capacity = $0.874J/g^0C$

Initial temperature= $T_i$ = $83.1^0C$

Final temperature = $T_f$ = $55.6^0c$

Change in temperature , $\Delta T=T_f-T_i=(55.6-83.1)^0C=-27.5^0C$

Putting in the values, we get:

$Q=27.6g\times 0.874J/g^0C\times -27.5^0C=-663J$

As the value of q is negative, it means the heat has been released and it is 663J

7 0

3 years ago

Which of the following has the highest electronegativity? A. Na B. Li C. C D. Si

koban [17]

Answer:

C. C, because it’s the highest of all four and C is 2,5 which is medium but the highest one.

3 0

3 years ago

Read 2 more answers

Whitch unit is not a measurement of volume

joja [24]

Answer:

I cant really explain what you cant use but you use cubic centimeters, cubic meters, or liters.

Explanation:

Remember the volume is how much space something takes up, and the only way to identify the volume is by using something you can convert into something else, like centimeters into cubic meters (100 cm³ is equal to 1 m³), and liters (same thing, but in liquid form.)

8 0

3 years ago

how many coefficients need to be changed to make this chemical equation balanced? Zn + HNO3 --> Zn (No3)2 + H2

mestny [16]

Coefficient 2 should be placed in the equation before the nitric acid in the reactant so that the chemical reaction becomes balanced.

The given chemical reaction is,

Zn + HNO3 --------> Zn (No3)2 + H2

Here, the elements Hydrogen, Nitrogen, and Oxygen are unbalanced.

These elements are altogether found in HNO₃ on the reactant side and are found as nitrate and hydrogen gas on the product side.

To balance the equation, the coefficient 2 is to be added in the reactant side so that 2 moles of Hydrogen, Nitrogen, and Oxygen would be balanced with 2 moles of Nitrate and two moles of Nitrogen.

On adding 2 on reactant side, we get

Zn + 2HNO3 -----------> Zn(NO3)₂ + H₂

This gives us a balanced equation and thus the equation could be balanced this way.

Therefore, coefficient 2 is to be added to make the equation to be balanced.

To know more about the balanced equation, click below:

brainly.com/question/26694427

#SPJ1

8 0

1 year ago

Which intermolecular force is common to all polar molecules but not nonpolar molecules? dispersion forces dipole-dipole forces h

Schach [20]

Answer:
Dipole-Dipole Forces are common to all polar molecules but not non polar molecules.

Explanation:
An Asymmetrical molecule having a region of high electron density (partial negative) and lower density (partial positive) interacts with its neighbor molecules through Dipole-Dipole Interactions. The partial positive part of one molecule interacts with the partial negative part of another.

Example:
Acetone having a partial positive carbon (of carbonyl group) and partial negative oxygen interacts through Dipole-Dipole forces. Hence, acetone does not involves Hydrogen Bond interactions.

5 0

4 years ago