Answer:
3.25×10²⁴ molecules
Explanation:
From the question given above, the following data were obtained:
Mass of H₂O = 97.2 g
Number of molecule of H₂O =?
From Avogadro's hypothesis, we understood that:
1 mole of H₂O = 6.02×10²³ molecules
Next, we shall determine the mass of 1 mole of H₂O. This can be obtained as follow:
1 mole of H₂O = (2×1) + 16
= 2 + 16
= 18 g
Thus,
18 g of H₂O = 6.02×10²³ molecules
Finally, we shall determine the number of molecules in 97.2 g of H₂O. This can be obtained as follow:
18 g of H₂O = 6.02×10²³ molecules
Therefore,
97.2 g of H₂O = 97.2 × 6.02×10²³ / 18
97.2 g of H₂O = 3.25×10²⁴ molecules
Thus, 97.2 g of H₂O contains 3.25×10²⁴ molecules.
A is the answer to the question you asked.
The mixing of Ni(NO3)2(aq) and Na2CO3(aq) will result in a precipitation reaction.
Ni(NO3)2(aq) + Na2CO3(aq) =====> NiCO3(s) + 2NaNO3(aq)
:-) ;-)
Answer:
- <em>If a piece of iron were placed close to this device, the iron nail would move toward the piece of iron.</em>
Explanation:
The description of the built device corresponds to a temporal electromagnet: as long as the battery is connected and supplying the potential difference (voltage) the iron nail will have magnet properties.
Since magnets attract and are attracted to iron, the iron nail and the piece of iron would feel attracted to each other.
The question is confusing because it asks what would happen to a piece of iron if it were placed close to this device, but it should be what happens to the iron nail if a piece of iron were placed close to this device.
Then, assuming the iron nail is free to move it would move toward the piece of iron due to the electromagnetic force.