First we need to find the number of moles of hydrogen gas formed
Zn + 2HCl ---> ZnCl₂ + H₂
stoichiometry of Zn to H₂ is 1:1
the number of Zn moles reacted - 2.4 g / 65.4 g/mol = 0.0367 mol
assuming Zn to be the limiting reactant
number of Zn moles reacted = number of H₂ moles formed
therefore number of H₂ moles formed = 0.0367 mol
we can use ideal gas law equation to find the pressure
PV = nRT
P - pressure
V - Volume - 450 x 10⁻⁶ m³
n - number of moles - 0.0367 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 32 °C + 273 = 305 K
substituting these values in the equation
P x 450 x 10⁻⁶ m³ = 0.0367 mol x 8.314 Jmol⁻¹K⁻¹ x 305 K
P = 206.8 kPa
pressure is 206.8 kPa
Answer:
See explanation.
Explanation:
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In this case, according to the described chemical reaction, we first write the corresponding equation to obtain:
Thus, we proceed as follows:
Part 1 of 3: here, since the molar mass of silver and copper (II) nitrate are 107.87 and 187.55 g/mol respectively, and the mole ratio of the former to the latter is 2:1, we can set up the following stoichiometric expression:
Part 2 of 3: here, the molar mass of copper is 63.55 g/mol and the mole ratio of silver to copper is 2:1, the mass of the former that was used to start the reaction was:
Part 3 of 3: here, the molar mass of silver nitrate is 169.87 g/mol and their mole ratio 2:2, thus, the mass of initial silver nitrate is:
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Answer:
Wood consists mainly of organic substances (99% of the total mass). Elemental chemical composition of wood of different breeds is practically the same. Absolutely dry wood on average contains 49% of carbon, 44% of oxygen, 6% of hydrogen, 0.1-0.3% of nitrogen. When burning wood remains its inorganic part - ash.
So the answer is flammability because wood is flammable.
Answer:
1 Lower
2 wider
Explanation:
It is lower and wider in range because impurities affects the crystalline lattice of sample structure theory causing a deviation from real melting point of pure sample.
Calculate the preexponential factor, A, for a reaction with a rate constant of 8.72 x 10-2 s-1 at a temperature of 350 K with an activation energy of 44.0 kJ/mol
- Use the Arrhenius Equation: k=Ae−Ea/RT. k is the rate constant, A is the pre-exponential factor, T is temperature and R is gas constant (8.314 J/molK) ...
- Use the equation: ln(k1k2)=−EaR(1T1−1T2) .
- Use the equation ΔG=ΔH−TΔS. .
<h3>What is
exponential factor?</h3>
The Arrhenius equation, an empirical link between temperature and rate coefficient, uses the pre-exponential factor or A factor as the pre-exponential constant. When determined through experiment, it is typically denoted by A, whereas collision frequency is typically left to Z.
Depending on the order of the reaction, the units of the pre-exponential factor A will differ from those of the rate constant. It has units of the first order reaction, s1. It is known as the frequency factor as a result.
The frequency factor, A, is dependent on both how frequently molecules collide when all concentrations are 1 mol/L and whether or not the molecules are appropriately orientated at the time of contact, according to collision theory.
To learn more about exponential factor from the given link:
brainly.com/question/19742435
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