Answer : The mass of oxygen consumed in the reaction is 14.6 grams.
Explanation :
First we have to calculate the change in moles of oxygen.
Formula used :
or,
where,
w = work done = 850.1 J
= change in moles of gas = ?
R = gas constant = 8.314 J/mol.K
T = temperature = 675 K
Now put all the given values in the above formula, we get:
Now we have to calculate the mass of oxygen consumed.
The balanced chemical reaction is,
Here, the volume changes of solids can be ignored.
From the balanced chemical reaction, we conclude that
The number of moles oxygen required for the complete reaction = 3
Change in mole of oxygen = 0.152 mol
Molar mass of 
= 32 g/mol
So,
The mass of oxygen consumed = 3 x 0.152 mol x 32 g/mol = 14.6 g
Therefore, the mass of oxygen consumed in the reaction is 14.6 grams.
Answer:
II and IV.
Explanation:
I. (INCORRECT). A model is a tentative to determinate a thing that can't be proved, and it's made based on evidence. If the model can explain the observation in nature, it is considered right, although it can be proved by a theory.
II. (CORRECT). The most accepted model of atoms says that they're formed by tiny particles, protons, neutrons, and electrons, with the first two on the nucleus, and the other surrounding it in an open space.
III. (INCORRECT). A heterogeneous mixture is a mixture of substances that is possible to identify phases of them, such as in oil and water. In the air, isn't possible to identify the constituents, and it's a homogeneous mixture.
IV. (CORRECT). Silver has atomic number 47, which is its number of protons. The atomic mass is the sum of protons and neutrons, so the number of neutrons is 108 - 47 = 61.
<span>A year, 365 days, is the time it takes for the Earth to travel around the Sun. A day, 24 hours, is the time it takes for the Earth to spin around once on its axis.</span>
The dichotomous key is not given here, however, the correct dichotomous key is as follows:
step- 1a cell has a nucleus and organelles - go to step 2
1b cell has no nucleus or organelles - bacterial cell
step- 2a cell has a cell wall - go to step 3
2b cell has no cell wall - animal cell
step- 3a cell has chloroplasts - plant cell
3b cell has no chloroplasts - fungal cell
Using this dichotomous key the cell can be identified as - Fungal cell.
A dichotomous key is an essential scientific tool that is used to find out the various kinds of organisms on their observable traits. Dichotomous keys have a series of statements with two different choices in each step that will take the student or user to the correct identification.
Identification of the given cell:
1. Follow step 1.
- If cells have a nucleus and organelles - yes then go to step 2
2. follow step 2.
- 2a. if cell has a cell wall - yes go to step 3
3. follow step 3.
- 3a. if cell has chloroplasts - no then fungal cell
Fungal cells have a nucleus and cell organelles enclosed with a cell wall around the plasma membrane but do not have chloroplast.
Thus, Using this dichotomous key the cell can be identified as - Fungal cell.
Learn more about fungal cells:
brainly.com/question/14470940
Answer:
it is the second one. Lead
