The molecular formula of a compound is C₂H₂O₄.
Take 100 grams of compound:
1) ω(C) = 26.7% ÷ 100% = 0.267
m(C) = ω(C) × m(compound)
m(C) = 0.267 × 100 g.
m(C) = 26.7 g.
n(C) = m(C) ÷ M(C).
n(C) = 26.7 g ÷ 12 g/mol.
n(C) = 2.22 mol; amount of carbon
2) ω(H) = 2.2 % ÷ 100% = 0.022
m(H) = 0.022 × 100 g.
m(H) = 2.2 g.
n(H) = 2.2 g ÷ 1 g/mol.
n(H) = 2.2 mol; amount of hydrogen
3) ω(O) = 71.1 % ÷ 100%.
ω(O) = 0.711
m(O) = 0.711 × 100 g
m(O) = 71.1 g
n(O) = 71.1 g ÷ 16 g/mol
n(O) = 4.4 mol; amount of oxygen
4) n(C) : n(H) : n(O) = 2.2 mol : 2.2 mol : 4.4 mol /2.2 mol.
n(C) : n(H) : n(O) = 1 : 1 : 2
M(CHO₂) = 45 amu; empirical formula
90 amu ÷ 45 amu = 2 CHO₂
More info about empirical formula: brainly.com/question/1873039
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Answer:
1? I guessed and I'm practicing on this stuff because I am new and I still need to learn this stuff
The SiC here is the chemical formula for silicon carbide. At the given temperature, the compound is in solid form. The heat needed to heat up the element from T₁ to T₂ is calculated through the equation,
ΔH = ncp(T₂ - T₁)
where ΔH is enthalpy, n is the number of moles, cp is the specific heat. From reliable source, the specific heat of the silicon carbide is equal to 1.34 J/mol°C.
Substituting the known values to the equation,
ΔH = (1 mole)(1.34 J/mol°C)(1000°C - 25°C)
ΔH = 1306.5 J
Thus, the heat needed is equal to 1306.5 J.
The explosion of the firework produces gases, and their electrons are excited. As they return to their ground state, they emit colored light according to the chemicals used: blues from copper compounds, yellow from sulfur, green from barium, and so on.
Answer:
The answer would be at 120°C