Answer:
Na₂CO₃•H₂O
Explanation:
After it is heated, the remaining mass is the mass of sodium carbonate.
30.2 g Na₂CO₃
Mass is conserved, so the difference is the mass of the water:
35.4 g − 30.2 g = 5.2 g H₂O
Convert masses to moles:
30.2 g Na₂CO₃ × (1 mol Na₂CO₃ / 106 g Na₂CO₃) = 0.285 mol Na₂CO₃
5.2 g H₂O × (1 mol H₂O / 18.0 g H₂O) = 0.289 mol H₂O
Normalize by dividing by the smallest:
0.285 / 0.285 = 1.00 mol Na₂CO₃
0.289 / 0.285 = 1.01 mol H₂O
The ratio is approximately 1:1. So the formula of the hydrate is Na₂CO₃•H₂O.
Answer:
The scientific laws have been well proven before they are published so it is difficult to prove mistakes
Explanation:
1. C
2. B
3. B
4. sorry, but we cant see the pictures. thats all I can do.
-Chad
1. put goggles on
2.but gloves on
3.put a lab coat on
Atomic weight = 197
symbol = Au
electrons = 79
neutrons = 197 - 79 = 118
<u>answer: E</u>
