Answer:
Scientists use the scientific method because it is evidence-based, standardized and objective in conducting experiments. The scientific method allows scientists to stick to facts and to avoid the influence of preconceived notions and personal biases in research processes, improving the credibility of research findings.
Explanation:
Answer is: mass of HCl is 15,6 g.
Chemical reaction: Mg + 2HCl → MgCl₂ + H₂.
m(Mg) = 5,2 g.
n(Mg) = m(Mg) ÷ M(Mg).
n(Mg) = 5,2 g ÷ 24,3 g/mol.
n(Mg) = 0,213 mol.
From chemical reaction: n(Mg) : n(HCl) = 1 : 2.
n(HCl) = 0,426 mol.
m(HCl) = 0,426 mol · 36,45 g/mol.
m(HCl) = 15,6 g.
The following chemical equation 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g) is balance and 48.64 grams of oxygen is required in the combustion of octane in gasoline.
<h3>What is combustion?</h3>
When burning of petrol happens and releases toxic hydrocarbons and carbon dioxide gasses with some amount of oxygen is known as combustion.
The balanced chemical equation is 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g),
number of moles = mass / molar mass
substituting the value in equation,
number of moles = 14 / 114g = 0.122 moles.
number of moles of oxygen 0.122 × 0.122 moles. = 1.52 moles.
1.52 = mass / 32
mass = 48.64 gram.
Therefore,48.64 grams of oxygen is required in the combustion of octane in gasoline.
Learn more about combustion, here:
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