Mass = 10.8 g
volume = 0.56 cm³
Density = mass / volume
D = 10.8 / 0.56
D = 19.29 g/cm³
Is Gold . ( Density of gold )
hope this helps!
Answer:
∆H° = 790 kJ/mol
Explanation:
Hello,
In this case, by using the Hess law, we should handle the given reactions as shown below:
- The reaction:
2 Sr(s) + O₂ (g) → 2 SrO (s)
Should be inverted as:
2 SrO (s) → 2 Sr(s) + O₂ (g)
So the enthalpy of reaction changes to ∆H° = 1184 kJ/mol
- The reaction:
CO₂ (g) → C (s) + O₂ (g)
Should be also inverted as:
C (s) + O₂ (g) → CO₂ (g)
So the enthalpy of reaction changes to ∆H° = -394 kJ/mol
- Then, we add the modified reactions to obtain the desired reaction:
2 SrO (s) + C (s) + O₂ (g) → 2 Sr(s) + O₂ (g) CO₂ (g)
C(s) + 2 SrO(s) → CO₂ (g) + 2 Sr(s)
Therefore, the resulting enthalpy of reaction is:
∆H° = 1184 kJ/mol - 394 kJ/mol
∆H° = 790 kJ/mol
Best regards.
The method is called the displacement method.
You place some water in the graduated cylinder and measure its volume.
Then you add your object and measure the new volume.
The difference between the two volumes is the volume of your object.
Answer:
Long-term condition of the atmosphere
Explanation:
A hypothesis is a prediction of what you believe to be true.