A: It creates a semi-permeable membrane that lets certain things in and keeps bad things out (large non polar stuff mostly with the exception of transport protiens) so protection
Taking into account the definition of avogadro's number, 3.37×10⁻⁷ moles of methane are 20.32×10¹⁶ molecules.
First of all, you have to know that Avogadro's number indicates the number of particles of a substance (usually atoms or molecules) that are in a mole.
Its value is 6.023×10²³ particles per mole and it applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 20.32×10¹⁶ molecules are contained in how many moles of methane?
amount of moles of methane= (20.32×10¹⁶ molecules × 1 mole)÷ 6.023×10²³ atoms
Solving:
<u><em>amount of moles of methane= 3.37×10⁻⁷ moles</em></u>
Finally, 3.37×10⁻⁷ moles of methane are 20.32×10¹⁶ molecules.
Learn more about Avogadro's Number:
Answer:
Valinomycin
Explanation:
This antibiotic is acquired from the Streptomyces species cells. Valinomycin is selective to potassium and inhibits sodium ions from entering the cell. This antibiotic allows the potassium ions to move down the electrochemical potential gradient of the lipid membranes.
Answer:
V = 15.2 L
Explanation:
STP means that T = 273 K and P = 1 atm.
We use the<em> PV=nRT equation</em> to <u>convert the given liters of oxygen to moles</u>:
- 1 atm * 7.6 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 273 K
Now we<u> convert O₂ moles to H₂O moles</u>, using the <em>stoichiometric coefficients</em> of the equation:
- 0.340 mol O₂ * = 0.68 mol H₂O
Finally we use the PV=nRT equation once again to<u> convert 0.68 moles of H₂O to liters</u>:
- 1 atm * V = 0.68 * 0.082 atm·L·mol⁻¹·K⁻¹ * 273 K