A common conversion factor is that 22.4 liters of a gas at STP is equal to one mole of that substance.
21 L / 22.4 L = 0.9375 moles of CO2
One mole of any substance contains an Avogadro’s number of atoms: 6.022 x 10^23 atoms/mol.
0.9375 mol x (6.022 x 10^23 atoms/mol) = 5.646 x 10^23 atoms of CO2
21 liters of CO2 contains 5.646 x 10^23 atoms of CO2.
Answer:
Explanation:
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In this case, since the solution is formed by sodium chloride and water, we understand that for one mole of solution, we have 0.132 moles of sodium chloride and 0.868 moles of water, therefore, by using their molar masses we can compute their masses in the solution:
Thereby, we can compute the weight/weight percent as follows:
So we use the previously computed masses:
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Answer:
2 valence electrons
Explanation:
it's a group 2 element. has 2 valence electrons in the outer energy level.
Answer:
3,5-dichlorohex-1-ene
Explanation:
The compound is; H2C=CH-C(Cl)H-CH2-C(Cl)H-CH3. We can rightly call this compound by the name, 3,5-dichlorohex-1-ene.
We arrived at this name by first counting the longest parent carbon chain, that gives hexane. The compound has a double bond at the 1-position. Also, there are two substituent chlorine atoms at positions 3 and 5 in the structure, hence the name given.