B) It has increased slightly
The mass in grams of 2.56x10-3 mol of iron is 0.143 g.
To calculate the mass in grams of 2.56x10-3 mol of iron, you need to use the molar mass of iron. The molar mass of iron is 55.845 g/mol. To find the mass in grams, you can use the following step-by-step calculation:
Mass (g) = Number of moles x Molar mass
Mass (g) = 2.56x10-3 mol x 55.845 g/mol = 0.143 g
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82 To which class of organic compounds do Freon-12 and Freon-14 belong? [1]
Answer:
- The structural formula for Freon-12 (CCl2F2)
F
|
Cl - C - Cl
|
F
It has the same structure as methane (CH4) with Hydrogen atoms replaced by Chlorine and Fluorine
- Freon-12 and Freon-14 belong halocarbons, a compound in which the Hydrogen of a hydrocarbon is replaced by halogens, like Chlorine and Fluorine.
c. Materials that only transfer thermal energy
b. Materials that transfer energy with no resistance
d. Materials that convert thermal energy into potential energy User: ______ is/are usually the best conductor/s.
a. Metals
c. Air
b. Water
d. Minerals
The answer would be B
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Answer:
To calculate the volume of 0.2 moles of H₂O (water), we need to use the relationship between moles, volume, and molar concentration. The molar volume of a gas at standard conditions (0°C and 1 atm pressure) is approximately 22.4 liters/mol. However, since water is in liquid form, we'll need to consider its density to calculate the volume.
The molar mass of water (H₂O) is approximately 18.01528 g/mol.
Given:
Moles of H₂O = 0.2 moles
Molar mass of H₂O = 18.01528 g/mol
We can calculate the mass of 0.2 moles of H₂O:
Mass = Moles × Molar mass
Mass = 0.2 moles × 18.01528 g/mol = 3.603056 g
Now, let's convert the mass to volume using the density of water. The density of water at room temperature (around 20°C) is approximately 1 g/cm³.
Given:
Mass = 3.603056 g
Density of water = 1 g/cm³
Volume = Mass / Density
Volume = 3.603056 g / 1 g/cm³ = 3.603056 cm³
So, the volume of 0.2 moles of H₂O is approximately 3.603 cm³ at room temperature and pressure.
Explanation: