15.9 KJ/mol Explanation: Given data: Temperature = T1 = 307 K, Temperature = T2 = 343 K, Gas constant R = 8.314 J/(mol • K), rate constant = k2/K1 = 89. To determine: Activation energy (in kJ/mol) = Ea =? Formula: The Arrhenius equation establishes the relationship between temperature and reaction rates. Here, in this equation, k = the rate constant, Ea = the activation energy, R = the Universal Gas Constant, T = the temperature. Solution: ln 89 = Ea / 8.314 J/mol.K * (0.0325 - 0.00291). then ln 89 = Ea / 8.314 J/mol.K * (2.95 x 10^2). Resulting in 4.488 = Ea / 8.314 J/mol.K * (2.95 x 10^2). Therefore, Ea = 4.488 * (2.95 x 10^2) / 8.314 J/mol.K which simplifies to Ea = 0.1324 / 8.314. Thus, Ea = 0.0159 and finally, Ea = 1.59 x 10^2 J/mol or 15.9 KJ/mol.
Solution:
The molecular formula is PbSO₄, indicating lead sulfate
Option c.
Explanation:
The percentage makeup shows that in 100 g of this compound, there are:
68.3 g of Pb, 10.6 g of S, and (100 - 68.3 - 10.6) = 21.1 g of O
To find the moles of each element, we divide by their molar masses:
68.3 g Pb / 207.2 g/mol = 0.329 moles Pb
10.6 g S / 32.06 g/mol = 0.331 moles S
21.1 g O / 16 g/mol = 1.32 moles O
Next, we find the mole ratio by dividing each by the smallest number of moles:
0.329 / 0.329 = 1 Pb
0.331 / 0.329 = 1 S
1.32 / 0.329 = 4 O
Thus, the molecular formula is PbSO₄, representing lead sulfate.
Answer:
Nylon and Spandex (Lycra).
Explanation:
These materials are designed to fit the body, with nylon drying more quickly than other types of fabrics, and Spandex being commonly found in swimming and sports apparel due to its elastic qualities. Both fabrics also wick moisture away and dry rapidly.
With high capacity and enhanced flexibility, nylon and Spandex provide a snug fit to the body and can retain their shape during various activities, making them ideal for swimming.
This explains why these materials are suitable based on the situation given.
More information is needed, but in general, a polyatomic ion consists of multiple atoms bonded together, often with instability that affects their bonding patterns.
