Answer:
500 cal
Explanation:
m=25g,c=1cal/g, change in temperature=70-50,20 degree Celsius Q=?
using formula Q=mxcx change in theta
Q=25x1x20
Q=500cal
What? That docent make any scene?
Answer:
Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
Explanat
Answer:
Temperature = 818 K
Explanation:
The given reaction is:
![2Na2O2 + H2O \rightarrow 4NaOH + O2](https://tex.z-dn.net/?f=2Na2O2%20%2B%20H2O%20%5Crightarrow%204NaOH%20%2B%20O2)
The change in enthalpy is: ΔH°= -109 kJ
The change in entropy is : ΔS° = -133.2 J/k = -0.1332 kJ/K
Based on the Gibbs-Helmholtz equation the standard free energy change is given as:
![\Delta G^{0}=\Delta H^{0}-T\Delta S^{0}](https://tex.z-dn.net/?f=%5CDelta%20G%5E%7B0%7D%3D%5CDelta%20H%5E%7B0%7D-T%5CDelta%20S%5E%7B0%7D)
At equilibrium ΔG° = 0. therefore:
![\Delta H^{0} = T\Delta S^{0}](https://tex.z-dn.net/?f=%5CDelta%20H%5E%7B0%7D%20%3D%20T%5CDelta%20S%5E%7B0%7D)
![T=\frac{\Delta H^{0}}{\Delta S^{0}}=\frac{-109}{-0.1332}=818 K](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B%5CDelta%20H%5E%7B0%7D%7D%7B%5CDelta%20S%5E%7B0%7D%7D%3D%5Cfrac%7B-109%7D%7B-0.1332%7D%3D818%20K)
The density of a solid object that has a mass of 1.62 lb and a volume of 190 mL is 3.87g/mL.
<h3>How to calculate density?</h3>
Density is the measure of the mass of matter contained by a unit volume. It can be calculated by dividing the mass of the substance by its volume.
According to this question, a solid object is said to have a mass of 1.62 lb and a volume of 190 mL.
1 pound = 453.592 grams
1.62 Ibs is equivalent to 734.82 grams
Density of the solid object = 734.82 grams ÷ 190 mL
Density = 3.87g/mL
Therefore, the density of a solid object that has a mass of 1.62 lb and a volume of 190 mL is 3.87g/mL.
Learn more density at: brainly.com/question/20337365
#SPJ1