Answer:
Explanation:
We want to convert from moles to grams, so we must use the molar mass.
<h3>1. Molar Mass</h3>
The molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.
- Phosphorus (P): 30.973762 g/mol
- Iodine (I): 126.9045 g/mol
Note that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.
- I₃: 126.9045 * 3=380.7135 g/mol
- PI₃: 30.973762 + 380.7135 = 411.687262 g/mol
<h3>2. Convert Moles to Grams</h3>
Use the molar mass as a ratio.
We want to convert 3.14 moles to grams, so we multiply by that value.
The units of moles of PI₃ cancel.
<h3>3. Round</h3>
The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.
The 2 in the ones place tells us to leave the 9.
3.14 moles of phosphorous triiodide is approximately equal to <u>1290 grams of phosphorus triodide.</u>
Answer:
228.3°C
Explanation:
Data obtained from the question include:
V1 (initial volume) = 506 cm3
T1 (initial temperature) = 147°C = 247 + 273 = 420K
V2 (final volume) = 604 cm3
T2 (final temperature) =?
The gas is simply obeying Charles' law because the pressure is constant.
The final temperature of the gas can be obtained by using the Charles' law equation V1/T1 = V2/T2 This is illustrated below:
V1/T1 = V2/T2
506/420 = 604/T2
Cross multiply to express in linear form as shown:
506 x T2 = 420 x 604
Divide both side by 506
T2 = (420 x 604) /506
T2 = 501.3K
Now let us convert 501.3K to a temperature in celsius scale. This is illustrated below:
°C = K - 273
°C = 501.3 - 273
°C = 228.3°C
Therefore, the temperature of the gas when the volume of the gas is 604 cm3 is 228.3°C
In gases the only thing that isn't related is acidity.