An isotope is when a normal atom has too many neutrons and its weight has been offset.
When the iron is not bonded to anything the oxidation number is 0 but when it is bonded to a nonmetal it will be positive. All reactions in which the oxidation number changes are considered redox.
Answer:
1.61 x 10²⁰ molecules
Explanation:
Given parameters:
Mass of the hydrogen gas = 8.01 x 10⁻⁴g
Unknown
Number of molecules of NH₃ = ?
Solution:
Given reaction:
N₂ + 3H₂ → 2NH₃
We have to solve from the known to the unknown
- The known specie is the mass of H₂ ;
find the number of moles of the specie;
number of moles = 
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles =
= 0.0004mol
- 3 moles of H₂ will produce 2 moles of NH₃
0.0004 moles of H₂ will produce
= 0.00027moles of NH₃
1 mole of a substance contains 6.02 x 10²³ molecules
0.00027mole of NH₃ will contain 0.00027 x 6.02 x 10²³
= 1.61 x 10²⁰ molecules
A carbon atom is not a metallic element. Its location on the periodic table indicates that it is a non metal since the further right something is on the periodic table, the less metallic that element is.
Answer:
ch4 + 2o2 gives co2+2h2o +891kj
Explanation:
becoz 891kj heat energy is given out
exothermic process means heat energy is given out/ released