Answer:
The temperature at which a substance changes from the liq- uid state to the solid state is called the freezing point. The freez- ing point of the liquid state of a substance is the same temperature as the melting point of the solid state. For example, solid water melts at 0°C and liquid water freezes at 0°C.
Explanation:
1) Reaction: 3Mg + N₂ → Mg₃N₂.
m(Mg) = 0,225 g
n(Mg) = 0,225 g ÷ 24,3 g/mol = 0,009 mol.
n(Mg) : n(N₂) = 3 : 1
n₁(N₂) = 0,003 mol.
n₂(N₂) = 0,5331 ÷ 28 = 0,019 mol.
n₃(N₂) = 0,019 mol - 0,003 mol = 0,016, m(N₂) = 0,016mol·28g/mol=0,4467g.
or simpler: m(N₂) = 0,225 g + 0,5331 - 0,3114 g = 0,4467 g.
2) Answer is: 6 <span>of fluorine atoms are combined with one uranium atom.
</span>m(U) = 209 g.
m(F) = 100 g.
n(U) = m(U) ÷ M(U)
n(U) = 209 g ÷ 238 g/mol.
n(U) = 0,878 mol.
n(F) = m(F) ÷ M(F)
n(F) = 5,263 mol
n(U) : n(F) = 0,878 mol : 5,263 mol /:0,878.
n(U) : n(F) = 1 : 6.
n - amount of substance
Producer gas is a fuel that is produced by burning biomass with an air deficit passed over red-hot coke (amorphous carbon). This gas is nothing but a mixture of gases such as hydrogen (H), carbon monoxide (CO), carbon dioxide (CO₂) and nitrogen (N₂).
The equation of producer gas is as follows -
CO₂ + 2N₂ (air) → CO + 2N₂
ΔH = -27.06 kcal
We know that,
1 Ton = 1000 kg
Mass of coke needed to form producer gas = 1.75 tons = 1750 kg
Given values,
Carbon monoxide (CO) = 25%
Carbon dioxide (CO₂) = 5%
Nitrogen (N₂) = 70%
One mole of carbon dioxide reacts with two moles of nitrogen to form one mole of carbon monoxide and nitrogen (producer gas).
We know that, 1 ton (1000 kg) of coke produces 470 Nm³ of producer gas, i.e.
470 × 4.359 = 2048.73 kg
1000 kg of coke produces = 2048.73 kg of producer gas
∴ 1 kg of coke produces = 2048.73 ÷ 1000 kg of producer gas
∴ 1750 kg of coke produces = 2048.73 × 1750 / 1000 = 3585.28 kg of producer gas.
Percentage yield = 87%
= 3585.28 × 87/100
= 3119.19 kg of producer gas
= 3.44 tons
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