Answer:
a compound can experience a chemical change if foreign body are in troduced
Earth's greenhouse gases trap heat in the atmosphere and warm the planet.
The first one
............
Answer:
48 g/mol
Explanation:
Step 1: Calculate the mass of the gas (m)
According to the law of conservation of mass, the mass of the solid before the decomposition must be equal to the sum of the masses of the solid residue and the gas
mSolid = mResidue + mGas
mGas = mSolid - mResidue = 4.73 g - 4.10 g = 0.63 g
Step 2: Convert 320 cm³ to L
We will use the conversion factor 1 L = 1000 cm³.
320 cm³ × 1 L/1000 cm³ = 0.320 L
Step 3: Calculate the moles of gas (n)
The gas is at room temperature (298.15 K) and room pressure (1 atm). We can calculate the moles of gas using the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 1 atm × 0.320 L/(0.0821 atm.L/mol.K) × 298.15 K = 0.0131 mol
Step 4: Calculate the molecular mass of the gas (M)
We will use the following expression.
M = m/n = 0.63 g/0.0131 mol = 48 g/mol
Answer:
The right choice is "wind power requires a lot of space and depends on local weather patterns "
Explanation:
- solar power produces harmful chemicals
- it is incorrect because solar power doesn't produce any chemicals
2. geothermal power requires more land than other power plants
-
it is incorrect because geothermal power requires digging a stable 5 km-deep shaft not a land
3. nuclear power produces small amounts of energy from large masses
- it is incorrect because nuclear power produces large amounts of energy from small masses.
So the right choice is "wind power requires a lot of space and depends on local weather patterns "
