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Bingel [31]
2 years ago
5

If 4.80 mol Ca mixed with 2 mol N2, which is the limiting reactant? 3Ca (s) + N2 (g) Ca3N2 (s)

Chemistry
1 answer:
Andreyy892 years ago
4 0
Nitrogen in the limiting reactant x
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The molecular mass of octane is 114.23g/mol and its density is 0.692 g/ml. How do I find the mass using the density?
Tamiku [17]

mass=density×volume

Explanation:

You can use this formula and multiply the density by the volume to find the mass.

3 0
3 years ago
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder
Margarita [4]

Complete Question

The diagram for this question is shown on the first uploaded image

The question to solve is shown on the second uploaded image  

Answer:

  1. The reaction is  exothermic
  2. The temperature of the water bath goes up
  3. The piston move out
  4. The system release  energy
  5. The amount of energy released is  \Delta E = - 287kJ

Explanation:

From the question we are told that

    The pressure is  P = 1 atm

    The amount of heat flow out of the system is  q = - 108 \ kJ

    The workdone by the system is  w = - 179 \  kJ

The first question is to state whether the reaction is exothermic  

      Yes this  reaction is exothermic because heat is being transferred out of the system

The second second question is to determine whether the temperature of the water goes up or down

   The temperature of the water goes up because above we see that the reaction is exothermic which means that heat is being transferred from the system to the surrounding which i the water bath in this case so this then implies that the temperature of the water in the water bath would go up

   

The third question is to determine whether the piston moves in or out  

         Now since work is done by  the system which would mean that its pressure would increase but we require a constant pressure of 1 atm and to achieve this the there is need for an increase in volume in order to return the pressure back to 1 atm and this can be achieved by the piston moving out

    The fourth question is to determine whether this reaction releases or absorbs energy

          We can determine this by looking at the first law of thermodynamics

which is stated mathematically as

           \Delta E = q + w

Where  w is the workdone by the system given in the question as (-179 kJ)

       \Delta E is the internal energy

         q is the heat  flowing out of the system which is given as  (-108 kJ)

Substituting this into the question we have that

       \Delta E = -108 -179

             \Delta E = - 287kJ

 This negative internal energy indicates that  energy is been released from the system.

   The fifth ask that we determine how much energy is been absorbed or released by the system

           The solution is already obtained in the fourth question an it is  

      \Delta E = - 287kJ

    When to understand that heat flow into a system mean that the system

 gains energy in form of heat so that energy with respect to the system is positive

    Also When heat i transferred out of a system it means that the system losses energy in form of heat so that energy in term of the system is negative  

  Note also that when an external body does work on a system that the workdone is done is positive

   But when a system does work on an external body the workdone is negative

   In the case of Internal energy

       When energy is absorbed by a system the then that energy in terms of the system is positive

   But when energy is released by the system to the surrounding then that energy is negative with respect to the system

3 0
3 years ago
Can a molecular formula ever be the same as an empirical formula? Explain your answer.
Marina CMI [18]

Answer:

The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula. Molecular formulas are compact and easy to communicate; however, they lack the information about bonding and atomic arrangement that is provided in a structural formula.

Explanation:

8 0
3 years ago
Read 2 more answers
If the amount of gas and volume are constant and you double the temperature of the gas, pressure halves
Lapatulllka [165]

Explanation:

if we fix the temperature, we are just left with PV = constant for the gas law. So, in this situation, if the volume is doubled, the pressure must go down by one-half. And vice-versa. The simplest illustration of this would be a cylinder with a plunger on one end: if you push the plunger in so that the volume of the cylinder is halved and the temperature remains constant, then the pressure will double.

7 0
3 years ago
Which of the following is equal to 2.0 liters? 200 mL 2,000 cm3 20 m3 20,000 mm3
ololo11 [35]
It equals 2000  but in this case it would be 20,000mm3
4 0
3 years ago
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