Answer:
See explanation
Explanation:
Precision means the reputability of measurement and accuracy means how close a measurement is to the actual value. To get the measured mass of the acetone we need to substract the mass of the bottle from the measured mass of bottle and acetone.
The mass of the bottle is 38.0015g
⇒The mass of acetone in bottle 1= 0.7783g
⇒Mass of acetone in bottle 2= 0.7780g
⇒Mass of acetone in bottle3= 0.7786g
The measured value is near to each other. ⇒ the measurements are <u>precise</u>.
To check the <u>accuracy</u> we can compare the average value to the actual mass of the acetone.
Average of the acetone measurement is (0.7783+0.7780+0.7786)/3 = 0.7783g
The percentage of difference of the average measurement to the actual mass is = {(actual value-measured value)/actual value}x100%
={(0.7791-0.7783)/0.7791}x100%
=0.10%
So we can see the difference is very small ⇒ the measurement is accurate.
<u>Answer:</u> The final pressure of the gas is 9.41 atm
<u>Explanation:</u>
To calculate the pressure of the gas, we use the equation given by ideal gas equation:
where,
P = pressure of the gas = ?
V = Volume of gas = 
(Conversion factor: 
)
n = Number of moles = 0.01 mol
R = Gas constant = 
T = temperature of the gas = ![300^oC=[300+273]K=573K](https://tex.z-dn.net/?f=300%5EoC%3D%5B300%2B273%5DK%3D573K)
Putting values in above equation, we get:
Hence, the final pressure of the gas is 9.41 atm
Answer:
A. N₂(g) + 3H₂(g) -----> 2NH₃ exothermic
B. S(g) + O₂(g) --------> SO₂(g) exothermic
C. 2H₂O(g) --------> 2H₂(g) + O₂(g) endothermic
D. 2F(g) ---------> F₂(g) exothermic
Explanation:
The question says predict not calculate. So you have to use your chemistry knowledge, experience and intuition.
A. N₂(g) + 3H₂(g) -----> 2NH₃ is exothermic because the Haber process gives out energy
B. S(g) + O₂(g) --------> SO₂(g) is exothermic because it is a combustion. The majority, if not all, combustion give out energy.
C. 2H₂O(g) --------> 2H₂(g) + O₂(g) is endothermic because it is the reverse reaction of the combustion of hydrogen. If the reverse reaction is exothermic then the forward reaction is endothermic
D. 2F(g) ---------> F₂(g) is exothermic because the backward reaction is endothermic. Atomisation is always an endothermic reaction so the forward reaction is exothermic
Br2 or O2 or N2 or H2 or F2 or I2 etc.
