1.An Mg-24 atom weighs 23.985 amu. How many grams does it weigh? How many microg

Question

1.An Mg-24 atom weighs 23.985 amu. How many grams does it weigh? How many micrograms? One amu is the same as 1.661 × 10-24 g. (Enter your answer to four significant figures.)

What is m(Mg-24) = ? g and m(Mg-24) = ? µg

2. If an atom weighs g, how many atomic mass units does it weigh? (Enter your answer to four significant figure

3. What would be the total mass of 28520 atoms of 24Mg? Give your answer in kilograms. (Enter your answer to four significant figures.) What would be the total mass of 28520 atoms of 24Mg? Give your answer in kilograms. (Enter your answer to four significant figures.)

Explanation / Answer

(1) 1 amu = 1.661 x 10^-24 g.

So, 23.985 amu = 23.985 x 1.661 x 10^-24 = 39.839 x 10^-24 gm. = 3.984 x 10^-23 g.(four significant figures)

mass in micro grams, m = (39.839 x 10^-24) / (10^-6) = 39.839 x 10^-18 µg = 3.984 x 10^-17 µg.

(2) Atomic Mass Unit is also refers as amu.

1 amu = 1.66 x 10^-24 g

(3) Total mass of 28520 atoms of 24Mg = 28520 x 1.66 x 10^-24 g = 4.734 x 10^-20 g = 4.734 x 10^-23 kg.

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