Answer:
(7x² - 7x + 12)/2x(x - 4).
Explanation:
- To do this calculation process:
We should common the denominator by multiplying the denominators of the two terms (2x)(x - 4) and dividing each denominator by the common denominator.
So, it will be equal:
[2x(3x) + (x -4)(x - 2)]/2x(x - 4)
= [6x² + x² - 7x + 12]/2x(x - 4)
= [7x² - 7x + 12]/2x(x - 4).
Answer:
4.952 × 10^28 atoms
Explanation:
1. Atoms in one molecule of glucose
The formula for glucose is C6H12O6.
In one molecule of glucose there are
6 + 12 + 6 = 24 atoms
2. Molecules of glucose
Molecules = 6853 mol × (6.022 × 10^23 molecules/1 mol)
= 4.1269 × 10^27 molecules
3. Atoms
Atoms = 4.1269 × 10^27 molecules × (12 atoms/1 molecule)
= 4.952 × 10^28 atoms
There are 4.952 × 10^28 atoms in 6853 mol of glucose
Answer:
P4Se3
Explanation:
Applying the Law of Conservation of Mass:
(133 mg total) - (45.8 mg P) = 87.2 mg Se
Dividing by the molar mass,
Phosphorus:-(45.8 mg P) / (30.97376 g P/mol) = 1.4786 mmol P
Selenium:-(87.2 mg Se) / (78.96 g Se/mol) = 1.1044 mmol Se
Divide by the smaller number of millimoles:
(1.4786 mmol P) / 1.1044 mmol = 1.339
(1.1044 mmol Se) / 1.1044 mmol = 1.000
multiply by 3, to get a whole number interger. then round to the nearest whole numbers to find the empirical formula.
Therefore the empirical formula is P4Se3
Answer:
False
Explanation:
A community consists of all the organisms in an ecosystem that belong to the same species. Population density occurs when two or more organisms seek the same resource at the same time. A carrying capacity is anything that restricts the number of individuals in a population.