The response to your inquiry is: option B. 0.25 atm
Explanation:
To solve this issue, the combined gas law must be applied:
P₁V₁ = P₂V₂ / T₁T₂
The data is as follows: P1 = 0.99 atm, V1 = 2 L, T1 = 273 K, P2 =?, V2 = 4 L, T2 = 137 K.
By isolating P2 in the equation, you find
P2 = P1V1T2 / T1V2. Substituting in the numbers gives: P2 = (2 x 0.99 x 137)/(273 x 4). The resulting P2 equates to approximately 0.25 atm.
Answer: The molecular formula will be 
Explanation:
When percentages are provided, we assume the total mass to be 100 grams.
Thus, the mass of each element corresponds to the specified percentage.
Mass of C= 70.6 g
Mass of H = 5.9 g
Mass of O = 23.5 g
Step 1: convert given masses to moles.
Moles of C =
Moles of H =
Moles of O =
Step 2: For determining the mole ratio, divide each molar amount by the smallest number of moles calculated.
For C = 
For H =
For O =
The resulting ratio of C: H: O= 4: 4: 1
Hence, the empirical formula obtained is 
The empirical weight is calculated as = 4(12)+4(1)+1(16)= 68g.
The molecular weight = 136 g/mole
Now the molecular formula needs to be obtained.
The molecular formula can be derived as=
Answer: The process of heating a crucible to eliminate moisture from a hydrate.
Explanation:
The available choices are:
a. Heating a solvent to aid in the dissolution of a solute.
b. Heating a solid in isolation to remove moisture.
c. Bringing water to a boil for use in a water bath.
d. Heating a crucible to eliminate moisture from a hydrate.
Possible actions that can be done on a hot plate include:
a. Heating a solvent to assist a solute in dissolving.
b. Heating a solid in isolation to dry it.
c. Heating water to boiling for a water bath.
However, it's important to note that using a hot plate for heating a crucible to remove water from a hydrate is not advisable. Silica or ceramic materials are not meant to be heated on a hot plate.
Consequently, the correct procedure is heating a crucible to remove water from a hydrate.
