Question
The student uses 3g of sodium hydrogen carbonate and 25cm^3 of citric acid.They record the initial tem perature as 25^circ C and the fina II temp erature as 18^circ C Calculate the energ y taken in from the C surr oundings using the equation below. Energy chonge (I)=Volume of solution (cm^3)times 4.2times Change in temperature (^circ C) 1 Change in tem perature The change in tem perature is tem perature - initial tem perature Change in temperature=^circ C- {}^circ C Change in temperature=^circ C
Answer
4.6
(425 Votes)
Norris
Master · Tutor for 5 years
Answer
## Step1: Change in temperature = Final temperature - Initial temperature =
## Step2: Energy change (J) = Volume of solution (cm^3) x 4.2 x Change in temperature (°C) =
The energy taken in from the surroundings is -735 J.
Explanation
## Step1: First, we need to calculate the change in temperature. The change in temperature is calculated by subtracting the initial temperature from the final temperature. ### The formula for the change in temperature is: ### **Change in temperature = Final temperature - Initial temperature**## Step2: Next, we need to substitute the given values into the formula. The final temperature is given as
and the initial temperature is given as
.## Step3: After substituting the values, we calculate the change in temperature.## Step4: Now, we need to calculate the energy taken in from the surroundings using the given formula.### The formula for energy change is: ### **Energy change (J) = Volume of solution (cm^3) x 4.2 x Change in temperature (°C)**## Step5: Substitute the given values into the formula. The volume of the solution is given as
and the change in temperature is calculated in the previous step.## Step6: After substitifying the values, we calculate the energy change.