calculate the number of particles in a) 3g of ammonia molecules
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Answer:
1.29 * 10^22 particles(molecules)
Explanation:
We would need to find the relative molecular mass (RMM) of the given compound using the atomic masses of elements constituting it. The atomic mass of Nitrogen is 14 and that of Hydrogen is 1.
Relative molecular mass of 1 molecule of ammonia = 14 + 1 * 3
RMM of ammonia molecule = 14 + 3 = 17 amu
Hence, we can write as,
14 gram of ammonia molecule contains 6.022 * 10^22 particles(molecules)
=> 1 gram of ammonia molecule contains [(6.022 * 10^22)/14] particles
=> 3 gram of ammonia molecule contains [{(6.022 * 10^22)/14}*3] particles
After solving we obtain,
3 gram of ammonia molecule contains 1.29 * 10^22 particles(molecules).
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