Answer:
Here's what I get
Explanation:
1. Addition of heat
The energy stored in the reactant is less than the energy stored in the products.
We had to add heat energy so the reactant would convert to products.
2. Balanced equation
CaCO₃ + heat ⟶ CaO + CO₂
240mL = 0,24L = 0,24 dm³
----------------------------------------
C = n/V
n = 3,5 M × 0,24dm³
n = 0,84 mol NaOH
1 mole NaOH ---------- 40g
0,84 mol ----------------- X
X = 40×0,84
X = 33,6g NaOH
:)
The sediment will most likely get smaller and smoother due to the continuous scrpaing against other things.
90 minutes is 1.5 hours.
5 kW * 1.5 hours = 7.5 kWh
8c/kWh * 7.5 kWh = 60 cents