Answer:
1)
a) 3.9 mol.
b) The limiting reactant here is HBr that is in a low no. of moles and Al is in excess.
2)
a) 5.45 mol.
b) The limiting reactant here is Si that is in a low no. of moles and N2 is in excess.
3)
a) 2.36 mol.
b) The limiting reactant here is KI that is in a low no. of moles and CuCl2 is in excess.
4)
a) 2.36 mol.
b) The limiting reactant here is O2 that is in a low no. of moles and FeS2 is in excess.
5)
a) 13.24 mol.
b) The limiting reactant here is NH3 that is in a low no. of moles and NO is in excess.
6)
a) 2.71 mol.
b) The limiting reactant here is O2 that is in a low no. of moles and C2H6 is in excess.
7)
a) 7.085 mol.
b) The limiting reactant here is NaOH that is in a low no. of moles and As is in excess.
8)
a) 5.632 mol.
b) The limiting reactant here is H2 that is in a low no. of moles and Au2S3 is in excess.
9)
a) 5.6625 mol.
b) The limiting reactant here is H2O that is in a low no. of moles and CO2 is in excess.
10)
a) 7.905 mol.
b) The limiting reactant here is Fe that is in a low no. of moles and O2 is in excess.
Explanation:
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Traditionally, gunpowder used in fireworks was made of 75 percent potassium nitrate also called saltpeter mixed with 15 percent charcoal and 10 percent sulfur; modern fireworks sometimes use other mixtures (such as sulfurless powder with extra potassium nitrate) or other chemicals instead
Answer:
3 (c)
Explanation:
All matter has density becuase all matter takes up space. When you wave your hand infront of yourself you feel wind. if air did not take up space it would all collapse into a black hole becuase their would be no resistance.
Wolf gang polli made the polli exlution princible, it says that all fermion particles take up space and can not be in the same place at the same time. This is why your legs hold up, your Piano doesent fall through the ground. if this wassent true everything would collaps into a black hole
Hope it helped
Natural abundance of oxygen I think
Answer:
Explanation:
These are present in group two and have two valance electrons.
All have high melting and boiling point.
All alkaline earth metals form salt with halogens.e.g
Mg + Cl₂ → MgCl₂
Ba + Br₂ → BaBr₂
Mg + Br₂ → MgBr₂
Ca + Br₂ → CaBr₂
They react with oxygen and form oxides of respective metal.
2Mg + O₂ → 2MgO
2Ba + O₂ → 2BaO
2Ca + O₂ → 2CaO
these oxides form hydroxide when react with water,
MgO + H₂O → Mg(OH)₂
BaO + H₂O → Ba(OH)₂
CaO + H₂O → Ca(OH)₂
With nitrogen it produced nitride,
3Mg + N₂ → Mg₃N₂
3Ba + N₂ → Ba₃N₂
3Ca + N₂ → Ca₃N₂
With acid like HCl,
Mg + 2HCl → MgCl₂ + H₂
Ba + 2HCl → BaCl₂ + H₂
Ca + 2HCl → CaCl₂ + H₂