Completion
Percent error is calculated by dividing the ___1____ of the error by the accepted value and then multiplying by ____2___.
1)ablsoute vale
2)100%
right on both.
thanks
when 2.0 g of NaOH were dissolved in 53.0 g water in a calorimeter at 24C, the temperature of the solution went up to 33.7C. Is this solution reaction exothermic?
To determine whether the solution reaction is exothermic or not, we can calculate the change in temperature (∆T) using the formula:
∆T = final temperature - initial temperature
∆T = 33.7°C - 24°C = 9.7°C
Now, we know that the specific heat capacity of water is 4.18 J/g·°C. To calculate the heat gained or lost by the solution, we can use the formula:
q = m·c·∆T
where:
q = heat gained or lost by the solution
m = mass of the solution (in this case, the mass of NaOH + water)
c = specific heat capacity of the solution
First, let's calculate the mass of the solution:
mass of NaOH = 2.0 g
mass of water = 53.0 g
mass of solution = mass of NaOH + mass of water = 2.0 g + 53.0 g = 55.0 g
Substituting the values into the formula:
q = (55.0 g) · (4.18 J/g·°C) · (9.7°C)
Calculating this expression gives us the amount of heat gained or lost by the solution. If the value is positive, it means heat was gained by the solution, indicating an endothermic reaction. If the value is negative, it means heat was lost by the solution, indicating an exothermic reaction.
By performing the calculations, we find:
q ≈ 2243.6 J
Since the calculated value of q is positive, it means heat was gained by the solution, indicating an endothermic reaction.
Therefore, based on the increase in temperature and the calculations, we can conclude that the solution reaction is endothermic.