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.
Givens
- V1 = 5.00 L
- V2 =?
- T1 = 298 K
- T2 = 333 K
Formula
V1/T1 = V2/T2
Note: This will be applicable only if the pressure remains constant.
Solution
5.00L / 298 K = x / 333 K. Multiply both sides by 333 K.
5.00 * 333 / 298 = x 333/ 333
V2 = 5.59 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: These celestial bodies are composed of rock or gas and are named after ancient deities.
Explanation:
Earth is the THIRD planet from the Sun and is capable of sustaining life for various organisms.
VENUS ranks as the second planet in our solar system and derives its name from the Roman goddess associated with love and beauty.
MARS, the fourth planet, gets its name from the Roman goddess of war.
Hence, Venus and Mars are NEIGHBORS to EARTH.
