Answer:
The sample with more oxygen atoms is a glass stirring rod.
Explanation:
Referring to the periodic table,
the glass stirring rod is composed of Silicon dioxide whereas the cotton ball is made of cellulose.
The molar mass of the glass stirring rod 
= 60.08 grams/mole.
The molar mass of the cotton ball 
= 162.09 grams/mole.
Considering the total number of molecules for oxygen is 32,
therefore,
In the glass stirring rod,
oxygen atoms contained in 5g = 
= 2.66 g of oxygen
= 
= 0.16625 moles
= 0.16625 x 
= 
atoms
In the cotton ball,
oxygen atoms contained in 5g = 
= 2.467 g of oxygen
= 
= 0.15418 moles
= 0.15418 
= 0.928 
Thus, the glass stirring rod has a greater quantity of oxygen atoms.
The new volume will be 33.5 L.
Explanation:
The kinetic theory of gases indicates that the space occupied by gas molecules is directly proportional to their temperature while being inversely proportional to the pressure. Assuming the number of moles is n = 1, the equation for gases can be written as:
PV = nRT
In this equation, P stands for pressure, V represents volume, R is the gas constant, and T denotes temperature.
Given that P = 523 Torr, T = 7.50 °C = 7.50 + 273.15 = 280.65 K, and the gas constant R = 62.363 Torr L mol⁻¹K⁻¹.
Consequently, the new volume will be 33.5 L.
Answer: second option: 1.70 to 1.40
Explanation:
1) pH is defined using the formula pH = - log [H₃O⁺]
2) Given that the initial concentration is x and after doubling it becomes 2x, we calculate:
pHi = - logx
pHf = - log 2x = - log 2 - logx
Thus, pHf - pHi = - log2 - logx - (- logx) = - log2 ≈ - 0.30
⇒ pHi - pHf = 0.30, indicating that the final pH (with twice the hydronium ions) is 0.30 lower than the starting pH.
3) The only option that indicates a 0.30 decline in pH is the second one: from 1.70 to 1.40. Therefore, that is the correct choice.
Answer:- 0.134 seconds
Solution:- The speed is given as 
and the circumference is 24900 miles which is same as the distance light have to covered. It asks to calculate the time required to cover this distance by the light.
Unit conversion is needed from miles to meters since the speed is given in meters per second.
1 mile = 1609.34 meters
Thus, 
= 40072566 meters
Now, 
Rearranged for time, that gives: 
Inserting the values:
= 0.134 seconds
Hence, light would take 0.134 seconds to traverse the indicated distance. The answer without the unit is 0.134.
The visual representation is displayed in the following image.
For calculations, consider 100 grams of the compound:
ω(Cl) = 85.5% ÷ 100%.
ω(Cl) = 0.855; signifying the mass percentage of chlorine in the compound.
m(Cl) = 0.855 · 100 g.
m(Cl) = 85.5 g; this represents the mass of chlorine.
m(C) = 100 g - 85.5 g.
m(C) = 14.5 g; indicating the mass of carbon.
n(Cl) = m(Cl) ÷ M(Cl).
n(Cl) = 85.5 g ÷ 35.45 g/mol.
n(Cl) = 2.41 mol; this is the quantity of chlorine.
n(C) = 14.5 g ÷ 12 g/mol.
n(C) = 1.21 mol; this is the quantity of carbon.
n(Cl): n(C) = 2.41 mol: 1.21 mol = 2: 1.
The compound in question is identified as dichlorocarbene CCl₂.
