C.
This is basically the definition of percent composition which is how much mass a element contributes to a specific molecule.
Density = mass / volume so
Density = 156 / 20.0
Density = 7.8 g/mL
Answer:
3.43 L
Explanation:
By the ideal gas law, when there is a state change, the quantities can be calculated by:
P1*V1/T1 = P2*V2/T2
Where P is the pressure, V is the volume, T is the temperature in K, 1 is the initial state, and 2 the final state.
P1 = 720 kPa, V1 = 562 mL, T1 = 45°C + 273 = 318 K
STP: P = 1 atm = 101.325 kPa, T = 273 K
720*562/318 = 101.325*V2/273
0.371153846V2 = 1272.45283
V2 = 3428 mL = 3.43 L
Answer:
2 chlorine atoms.
Explanation:
H₂ + Cl₂ → 2HCl
The Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction.
If 2 molecules of Hydrogen and 2 molecules of Chlorine is present in the reactants, the same no. of atoms should also be present in the product.
∴ the no. of chlorine atoms in the product is 2.
