Question

7 fill in the blank 1 point round 0.199 moles to 2 significant figures. type your answer... moles 8 multiple choice 1 point what happens at the particle level when temperature increases? the particles get larger. the particles have more frequent or forceful collisions. the particles move faster. the particles spread apart. 9 formula 1 point a gas occupies 250.2 ml at a temperature of 24.5 °c. what is the volume, in ml, at 71.6 °c? round to 1 decimal place. answer

Explanation:

Step1: Identify significant - figure rules

For a number less than 1, non - zero digits after the first non - zero digit are significant. To round 0.199 to 2 significant figures, we look at the third digit.

Step2: Apply rounding rule

Since the third digit 9 is greater than 5, we round up the second digit. So 0.199 rounds to 0.20.

Step3: Solve multiple - choice question

According to the kinetic - molecular theory, when temperature increases, the average kinetic energy of particles increases, and the particles move faster. The answer is "The particles move faster."

Step4: Use Charles's Law

Charles's Law is $\frac{V_1}{T_1}=\frac{V_2}{T_2}$, where $V_1 = 250.2$ mL, $T_1=(24.5 + 273.15)$ K = 297.65 K, and $T_2=(71.6+273.15)$ K = 344.75 K.
First, we can re - arrange the formula for $V_2$: $V_2=\frac{V_1T_2}{T_1}$.
Substitute the values: $V_2=\frac{250.2\times344.75}{297.65}$.
$V_2=\frac{86256.45}{297.65}\approx289.8$ mL.

Answer:

0.20 moles
The particles move faster.
289.8 mL