Answer:
Because the heat energy provided at the moment of melting and freezing are used up in the transformation of the state of matter!!
Thus the temperature remains the same
Answer: 1.93 x 10^24 molecules
Explanation:
CH4 is the chemical formula for methane, the first member of the alkane family.
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 molecule
So, 1 mole of CH4 = 6.02 x 10^23 molecules
3.2 moles of CH4 = Z
To get the value of Z, cross multiply:
(Z x 1 mole) = (6.02 x 10^23 molecule x 3.2 moles)
Z•mole = 19.26 x 10^23 molecules•mole
Divide both sides by 1 mole
Z•mole / 1 mole = 19.26 x 10^23 molecules•mole/ 1mole
Z = 19.26 x 10^23 molecules
Place Z in standard form
Z = 1.93 x 10^24 molecules
Thus, 3.2 moles of ch4 has 1.93 x 10^24 molecules
Answer:
Chilling the hydrogen peroxide solution
Explanation:
The MnO₂ is acting as a catalyst.
Chilling the hydrogen peroxide solution reduces the average kinetic energy of the H₂O₂ molecules.
Fewer of them will have enough kinetic energy to overcome the activation energy of the reaction. The rate will decrease.
A is wrong. Using a larger amount of solution does not increase the number of H₂O₂ molecules that can reach the surface of the catalyst per second. There is no effect on the rate.
B is wrong. Increasing the mass of the cube increases its surface area. More molecules of H₂O₂ can reach the surface of the catalyst per second. The rate increases.
D is wrong. Smashing the cube into pieces vastly increases the surface area, so the rate increases
Answer:
The pressure of the gas after getting compressed is 1.92 L.
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
(At constant temperature)
where,
are initial pressure and volume.
are final pressure and volume.
We are given:
![P_1=2.31 atm\\V_1=8 L\\P_2=?mmHg\\V_2=1.92 L](https://tex.z-dn.net/?f=P_1%3D2.31%20atm%5C%5CV_1%3D8%20L%5C%5CP_2%3D%3FmmHg%5C%5CV_2%3D1.92%20L)
Putting values in above equation, we get:
![2.31 atm\times 8 L=P_2\times 1.92 L](https://tex.z-dn.net/?f=2.31%20atm%5Ctimes%208%20L%3DP_2%5Ctimes%201.92%20L)
![P_2=\frac{2.31 atm\times 8 L}{1.92 L}](https://tex.z-dn.net/?f=P_2%3D%5Cfrac%7B2.31%20atm%5Ctimes%208%20L%7D%7B1.92%20L%7D)
![P_2=9.625 atm](https://tex.z-dn.net/?f=P_2%3D9.625%20atm)
The pressure of the gas after getting compressed is 1.92 L.
Answer:
5.00 mol O₂
Explanation:
In order to solve this problem we will need to <u>convert moles of water to moles of oxygen</u>. We will do that using the <em>stoichiometric coefficients, </em>as follows:
- 10.0 mol H₂O *
= 5.00 mol O₂
Thus 5.00 moles of oxygen would be produced from 10.0 moles of water.