The correct answer is exactly 750 g.
Since the mass of board is 750 g, the mass of the pile of sawdust after the whole board is ground down is 750 g.
This is according to the Law of conservation of mass. According to this law, matter can neither be created nor destroyed by any physical transformations or chemical reactions. In any chemical reaction the mass of the products is equal to the mass of the reactants.
Here the board undergoes a physical transformations from being a whole board to a pile of sawdust. Thus according to the Law of conservation of mass, the mass of the whole board will be equal to the mass of a pile of sawdust.
Answer:
Hardness.
Lustre.
Colour.
Crystal Structure.
Explanation: hope i helped :0
Answer:
The value of K at this temperature = 2.25
Explanation:
According to question the equilibrium reaction is
H₂(g) + I₂(g) ⇄ 2 HI(g)
Initial concentration 2 2 8
At equilibrium 2 + 2x 2 + 2x 8 - 2x
At equilibrium concentration of HI changes to become 6 Molar
So 8 - 2x = 6
or, x = 1
So concentration of H₂ = 2 + 2 x 1 = 4 molar
concentration of I₂ = 2 + 2 x 1 = 4 molar
Kc =
⇒ Kc =
⇒ Kc = = 2.25
Answer:
3.02 atm
Explanation:
Step 1: Given data
- Initial pressure (P₁): 1.36 atm
- Initial volume (V₁): 4.24 × 10² mL
- Initial temperature (T₁): 25 °C
- Final volume (V₂): 1.91 × 10² mL
- Final temperature (T₂): 25 °C
Step 2: Find the final pressure
Since the temperature is constant, we can find the final pressure using Boyle's law.
Answer:
Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14. ... For example, it reacts with dilute hydrochloric acid to produce sodium chloride solution.