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Answer:
Si14- Si^4+
As33- As^3-
Mg12- Mg^2+
Rb37- Rb^+
F9- F^-
Ge32- Ge^4+
Sn50- Sn^2+, Sn^4+
Explanation:
The elements shown in the answer have their common ions written beside them.
Silicon mostly forms positive ions in oxyacids and complex ions. Arsenic mostly forms its anion. Magnesium forms only the +2cation just as rubidium only forms the +1 cation. The fluoride ion is F^- while tin may for a +2*or +4 cation. Germanium usually forms the +4 cation.
The volume of H₂ evolved at NTP=0.336 L
<h3>Further explanation</h3>
Reaction
Decomposition of NH₃
2NH₃ ⇒ N₂ + 3H₂
conservation mass : mass reactants=mass product
0.28 NH₃= 0.25 N₂ + 0.03 H₂
2 g H₂ = 22.4 L
so for 0.03 g :
Answer:
% Fe in the sample = 22.0%
Explanation:
The redox reaction between iron and permanganate is:
Moles of permanganate required is:
Based on the reaction stoichiometry:
5 moles of iron requires 1 mole of permanganate solution
Therefore, 0.000392 mols of permanganate would need:
Mol mass of iron (Fe) = 55.845 g/mol
Mass of iron present is:
<u>Answer:</u> In molecule, there are 2 atoms of hydrogen present.
<u>Explanation:</u>
Coefficients are defined as the numbers that are written in the front of atoms or molecules during a chemical reaction. They represent the number of moles of the substance present in a chemical reaction.
<u>For Example:</u>
2 moles of hydrogen gas is reacting with 1 mole of oxygen gas to produce 2 moles of water molecule.
Subscript numbers are defined as the number of atoms of each element present in a compound.
<u>For Example:</u> In , 2 atoms of oxygen element is there and 1 atom of carbon element is there.
Superscript numbers are defined as the charges of ions reacting in a chemical reaction.
<u>For Example:</u> In , 2+ charge is present on calcium ion.
We are given:
A molecule of hydrogen which is
The number '2' is present in subscript, which represents the number of atoms in a molecule or a compound.
Hence, in molecule, there are 2 atoms of hydrogen present.