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Answer:
Copper
Explanation:
copper is used in the wiring of the phone
Answer:
Ca(OH)₂ (aq) + 2NH₄Cl (aq) → CaCl₂ (aq) + 2NH₃ (g) + 2H₂O (l)
Ca²⁺ + 2OH⁻ + 2NH₄⁺ + 2Cl⁻ → Ca⁺² + 2Cl⁻ + 2NH₃ (g) + 2H₂O (l)
2OH⁻ + 2NH₄⁺ → 2NH₃ (g) + 2H₂O (l)
Answer: The sample that contains the greater number of molecules is water.
Explanation: To calculate the number of molecules, it is used the Avogadro's number (
particles/molecules). So, considering that the mass to water and carbon dioxide is 1g (it can be any other number), the relationship between moles and molar weight is:

To water:
= 0.05 moles.
Therefore,
1 mol ----
molecules
0.05 moles ---- x
x =
molecules of water.
To carbon dioxide:
= 0.02 moles.
Therefore,
1 mol ----
molecules
0.02 moles ---- y
y =
molecules of carbon dioxide.