Answer:
5.645 × 10⁻²³ g
Solution:
Step 1) Calculate Molar Mass of SH₂;
Atomic Mass of Sulfur = 32 g/mol
Atomic Mass of H₂ = 2 g/mol
--------------------
Molecular Mass of SH₂ = 34 g/mol
Step 2: Calculate mass of one molecule of SH₂ as;
As,
Moles = # of Molecules / 6.022 × 10²³
Also, Moles = Mass / M.Mass So,
Mass/M.mass = # of Molecules / 6.022 × 10²³
Solving for Mass,
Mass = # of Molecules × M.mass / 6.022 × 10²³
Putting values,
Mass = (1 Molecule × 34 g.mol⁻¹) ÷ 6.022 × 10²³
Mass = 5.645 × 10⁻²³ g
Answer:
42.3%
Explanation:
By the reaction given the stoichiometry between MnO₄⁻ and Fe⁺² is 1 mol of MnO₄⁻ to 5 moles of Fe⁺². When KMnO₄ dissolves, it forms the same amount of K⁺ and MnO₄⁻ (1:1:1), so the number of moles of MnO₄⁻ used is:
n = Volume*concentration
n = 0.0216 L * 0.102 mol/L
n = 2.20x10⁻³ mol
1 mol of MnO₄⁻ -------------------- 5 moles of Fe⁺
2.20x10⁻³ mol ---------------------- x
By a simple direct three rule
x = 0.011 mole
The molar mass of iron is 55.8 g/mol. The mass is the molar mass multiplied by the number of moles, thus:
m = 55.8*0.011
m = 0.614 g
Then, the percent of iron in the ore is:
(mass of iron/ mass of ore) *100%
(0.614/1.45)*100%
42.3%
Answer:
6 elements which are carbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus
Explanation:
Living organisms are made up of various unit of giant organic molecules that have been produced through life processes.
The bulk of elements that makes up living organisms are carbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus.
Carbon is almost present everywhere in living organisms. It's unique ability to form a key component lies on its bond formation capabilities. Carbon is found in nearly all organic molecules like carbohydrates, proteins, fats and oils, e.t.c
Hydrogen like carbon is key to life. It is light and making it form different bond types with carbon. It is one of the atoms that makes up water.
Nitrogen is usually found in proteins. They are unique elements that life cannot do without.
Oxygen is useful in respiration processes and it is the bedrock through which energy is released from glucose.
Sulfur is key to life.
Phosphorus in Adenosine Diphosphate is a good store of energy.
Answer:
number of protons is the correct answer. Brainliest please
