Answer:
15 (Fifteen) trigonal planar carbon atoms.
Explanation:
Geometry around Carbon atom is basically controlled by the type of hybridization it follows. Carbon atom gives three types of hybridizations as;
Sp³ Hybridization:
In this type carbon atom is involved in making four single bonds with other atoms. Hence, the geometry about sp³ hybridized Carbon is tetrahedral.
Sp² Hybridization:
In this type carbon atom is involved in making two single bonds and one double bond with other atoms. Hence, the geometry about sp² hybridized Carbon is trigonal planar.
Sp Hybridization:
In this type carbon atom is involved in making one single bond and one triple bond with other atoms. Hence, the geometry about sp hybridized Carbon is linear.
Result:
In the structure of Metaxanthene there are 15 carbons (highlighted red) which are sp² hybridized. Therefore, there are 15 trigonal planar carbons in Metaxanthene.
Answer is: <span>1 mol CH</span>₄/<span>16,0 g CH</span>₄.
Chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.
m(CH₄) = 50,6g.
M(CH₄) = 16g/mol.
n(CH₄) = m(CH₄) ÷ M(CH₄) = 50,6g ÷16g/mol = 3,16mol.
n(CH₄) : n(CO₂) = 1:1.
nCO₂) = 3,16mol.
m(CO₂) = m(CO₂) · m(CO₂) = 3,16mol · 44g/mol = 139,15g.
M - molar mass.
n - amount of substance.
Ethanol is polar because the oxygen atoms attract electrons because of their higher electronegativity than other atoms in the molecule. Thus the -OH group in ethanol has a slight negative charge. Ammonia (NH3) is polar. Sulfur dioxide (SO2) is polar.
Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
hope this helps
