Answer:
No matter if you are on Earth, the moon or just chilling in space, your mass does not change. But your weight depends on the gravity force; you would weigh less on the moon than on Earth, and in space you would weigh almost nothing at all.
The balanced equation for the above neutralisation reaction is as follows;
2KOH + H₂SO₄ --> K₂SO₄ + 2H₂O
stoichiometry of KOH to H₂SO₄ is 2:1
neutralisation is the reaction between H⁺ ions and OH⁻ ions to form water which is neutral
number of KOH moles - 1.56 mol
2 mol of KOH require 1 mol of H₂SO₄ for neutralisation
therefore 1.56 mol of KOH require - 1/2 x 1.56 mol = 0.78 mol
0.78 mol of H₂SO₄ are required for neutralisation
First, we need to find the
limiting reactant. <span>
149 g Al x 1 mole/27g Al = 5.52 mol Al
601 g Fe2O3 x 1 mole/159.6g Fe2O3 = 3.77 mol Fe2O3
<span>Al is the limiting reactant since 3.77 mol Fe2O3 would
require 3.77*2 = 7.54 mol Al but the given is less.
<span>mol Al2O3 = 5.52 mol Al * 1 mol Al2O3 / 2 mol Al
= 2.76 mol</span>
mass Al2O3 = 2.76 mol x 102g/1 mole AlO3 = 281.52 g Al2O3
will be formed. </span></span>
<span>
Since 3.77 mole of Fe2O3 is present, but 5.52 mole Al is the
limiting reactant, then only 5.52/2 mole Fe2O3 can be used. This leaves an
excess of:</span>
Fe2O3 excess = 3.77 – 5.52/2
= 1.01 <span>
<span>1.01 mole Fe2O3 x 103.8g/1 mole Fe2O3 = 104.84 g Fe2O3 </span></span>
Answer:
All atoms of the same element have the same number of protons
Explanation:
All atoms of the same element have the same number of protons. The atoms are formed by protons, neutrons (both located in the nucleus) and electrons located on the outside. The number Z characterizes each element (corresponds to the number of protons located in the nucleus, which coincides with the number of electrons). The number A corresponds to the sum of protons and neutrons of an element (it varies in isotopes, since the number of neutrons varies).
Answer:
Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.