Answer:
12.306
Explanation:
12.3+0.005675=12.305675 just put answer as 12.306
Whichever one has a negative enthalpy value.
Answer is: 4,4 grams <span>of carbon dioxide gas would be produced.
</span>Chemical reaction: CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O.
m(CaCO₃) = 10 g.
n(CaCO₃) = 10 g ÷ 100 g/mol.
n(CaCO₃) = 0,1 mol.
From chemical reaction: n(CaCO₃) : n(CO₂) = 1 : 1.
n(CO₂) = 0,1 mol.
m(CO₂) = n(CO₂) · M(CO₂).
m(CO₂) = 0,1 mol· 44 g/mol.
m(CO₂) = 4,4 g.
Answer:
Relative and average atomic mass both describe properties of an element related to its different isotopes.
Explanation:However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.
Calories is a unit of energy, so we need to calculate the energy or heat absorbed or released by the system. We use the equation:
U = mCpΔT
where:
m = mass of material
Cp = specific heat capacity of material
ΔT = (Tf - Ti) = temperature change
First, you must look for the specific heat capacity of copper. You can use any chemistry or engineering book or website. According to Engineering Toolbox, the specific heat capacity of copper is 0.09 cal/(g-°C).
U = 200(0.09)(33-28) = 90 calories
Since the value is positive, energy is absorbed.