Explanation:
Percentage composition of oxygen = (80/134) * 100% = 59.7%.
What is Chemical Reaction?
A chemical reaction is the chemical transformation of one set of chemical components into another.
Main Content
Mass of aluminium sulfide is 158g
Mass of water is 131g
The chemical reaction: 
First, balance the chemical equation
Aluminium sulfide has a molar mass of 150.16 g/mol and water has a molar mass of 18.02 g/mol. As a result, the moles of aluminum sulfide are computed as follows:
From the chemical reaction , the ratio of molar is 3mol 
So, the moles of hydrogen sulfide are:
= 7.26mol
From the chemical reaction, the molar ratio is 3 mol 
mol 
So, the moles of hydrogen sulfide are:
Moles of 
formed = 7.26 mol 
Th liming reactant is
beacuse the mass of forms less product than water. Therefore, the maximum number of moles of is 3.15 mol. We know that molar mass of is 34.10g/mol. So, the maximum mass of formed is,
Molar mass of
= 3.15 mol 
34.10g/mol
= 107.4g
Now, multiplying the number of moles of by the molar ratio between 
and 
which is 6mol 
we get the number of moles of reacted.
Moles of reacted = 1.05 mol 
= 6.31 mol
The mass of is,
= 6.31 mol 18.02g/ mol
= 114g
On subtracting, the mass of reacted from the given mass of is,
= (131-114)g
= 17g
Hence, the excess remaining reactant is 17g
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The question is incomplete. Complete question is:
Which list represents the classification of the
elements nitrogen, neon, magnesium, and
silicon, respectively?
(1) metal, metalloid, nonmetal, noble gas
(2) nonmetal, noble gas, metal, metalloid
(3) nonmetal, metalloid, noble gas, metal
(4) noble gas, metal, metalloid, nonmetal
.................................................................................................................
Answer: The correct answer is option 2) nonmetal, noble gas, metal, metalloid
Reason:
1) Non-metal are bad conductors of electricity. Also non-metal are electronegative in nature. Hence, among the provided elements, nitrogen satisfied the criteria. Hence, it is a non-metal.
2) Noble gas are the elements which have completely filled outermost shell. Hence, among the provided elements, Neon satisfied the criteria.
3) Metal are good conductors of electricity. Also metal are electropositive in nature. Hence, among the provided elements, magnesium satisfied the criteria. Hence, it is a metal.
4) Metalloid have conductivity better than non-metals but poor than conductors. Hence, among the provided elements, Silicon satisfied the criteria. Hence, it is a metalloid.
Answer:
Hey mate, here is your answer. Hope it helps you.
Explanation:
To show how substances in a chemical reaction interact and to keep track of all elements and the number of atoms in each element on each side of the equation.The purpose of writing a balanced chemical equation is to know: the reactants (starting material) and products (end results) that occur. the ratios in which they react so you can calculate how much reactants you need and how much products can be formed.
Answer:
Explanation:
Water is called the universal solvent. It is a polar molecule (105 degree angle between the H atoms) that gives it a + and a - side so to speak....which allows it to 'pull apart' substances....overcome their intra-molecular attractions to each other ...i.e. disssovle them
