The O₂ and the CO₂ gas exchange occurs in alveoli. the oxygen gas moves from the lungs and at same time carbon dioxide passe the the lungs from the blood and the gas exchange occurs.
The oxygen gas moves from the lungs and at same time carbon dioxide passe the the lungs from the blood and gas exchange between the alveoli and the tiny blood vessels occurs. the tiny blood vessels are called as the capillaries. the capillaries are located at the alveoli walls. every person has the hundred of millions of the alveoli present in their lungs.
Thus, in the alveoli the exchange of the oxygen gas and the carbon dioxide gas will occurs.
To learn more about the alveoli here
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Combustion is burning and that usually produces carbon in the reaction adding it to the atmosphere
Answer:
The correct option is: B. 13g
Explanation:
Given: Molar mass of iron (II) sulfate: m = 260g/mol,
Molarity of iron (II) sulfate solution: M = 0.1 M,
Volume of iron (II) sulfate solution: V = 500 mL = 500 × 10⁻³ = 0.5 L (∵ 1L = 1000mL)
Mass of iron (II) sulfate taken: w = ? g
<em>Molarity</em>: 
Here, n- total number of moles of solute, w - given mass of solute, m- molar mass of solute, V- total volume of solution in L
∴ <em>Molarity of iron (II) sulfate solution:</em> 
⇒ 
⇒ 
⇒ <em>mass of iron (II) sulfate taken:</em> 
<u>Therefore, the mass of iron (II) sulfate taken for preparing the given solution is 13 g.</u>
Answer:
Molar Mass = 171.6 g/mol
Explanation:
Here we can use the equation PV = nRT, where n could stand for m / M, considering M = Molar Mass. Now we can rearrange this equation to isolate M, as we have to determine the " molar mass " of this vapor,
PV = ( m / M )RT,
density = mass / volume = PM / RT -
M = dRT / P
First convert celcius to kelvins and torr to " standard atmosphere " before plugging in the known values,
13 C = 286 K,
741 torr = 0.975 atm -
__________________________________________
M = (7.125)(0.0821) (286) / 0.975
M = 171.6 g /mol
Answer:
O, S, Se, Te, Po
Explanation:
O, S, Se, Te, Po are all elements found in group sixteen of the periodic table. Remember that the commonality between all the elements in the same group of the periodic table is that they all possess the same number of outermost electrons. All elements in the same group must have the same number of outermost electrons in their outermost shell.
Now, having six electrons in their outermost shell implies that they readily bond with two other atoms to complete their octet. In accordance with the octet rule. This explains why oxygen bonds with calcium by gaining two electrons in calcium oxide.
