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Galina-37 [17]
2 years ago
7

The mass number of 3 isotopes of magnesium are 24,25,26.what is the mass number of the most abundant isotope of magnesium.​

Chemistry
1 answer:
Anarel [89]2 years ago
7 0

Answer:

24.4 amu or g/mole

Explanation:

24 x 0.790 = 19.0 amu

25 x 0.100 = 2.50 amu

26 x 0.110 = 2.86 amu

(Because of the 19.0, the sig figs go only to the 1/10 decimal place)

19.0 + 2.5 + 2.9 = 24.4 amu or g/mole

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The isomerization of methyl isonitrile, CH3NC, to acetonitrile, CH3CN, was studied in the gas phase at 215oC, and the following
Viefleur [7K]

Answer:

2.75 × 10⁻⁶ M/s

1.69 × 10⁻⁶ M/s

9.23 × 10⁻⁻⁷ M/s

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Explanation:

We have the following information for the isomerization of methyl isonitrile

Time (s)      [CH₃NC] (M)

  0              0.0165

2000          0.0110

5000          0.00591

8000          0.00314

12000         0.00137

15000         0.00074

To calculate the average rate of reaction (r) for each interval, we need to use the following expression:

r = -Δ[CH₃NC]/Δt

Interval 0-2000 s

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Interval 2000-5000 s

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Interval 5000-8000 s

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Interval 8000-12000 s

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3 0
2 years ago
What is the density of water if you have 50.0 grams of water and a volume of 50.0 millimeters
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Answer:

\boxed {\tt 1.0 \ g/mL}

Explanation:

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The mass of the water is 50.0 grams.

The volume of the water is 50.0 milliliters.

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Substitute the values into the formula.

d=\frac{50.0 \ g}{50.0 \ mL}

Divide.

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