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3 years ago

How many moles of Magnesium are present in 0.478 g of the element? (Atomic mass: Mg-24 u)

Chemistry

1 answer:

Oksanka [162]3 years ago

8 0

Answer:

0.0199moles

Explanation:

The number of miles of a substance can be calculated using the formula:

Number of moles (n) = Mass (M) / Molar mass (MM)

In this question, the mass of Magnesium element (Mg) = 0.478 g while the atomic mass is 24

Therefore, number of moles of Magnesium is:

Moles = 0.478/24

Moles = 0.01992

Hence, 0.0199 moles of Magnesium are contained in 0.478 g of the element.

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The frequency of an x-ray wave is 3.0 x 1012MHz. Its wave speed is 3.0x 108m/s. Calculate the wavelength of the x-ray wave below

jasenka [17]

Answer: The wavelength of the x-ray wave is $10^{-10}m$

Explanation:

To calculate the wavelength of light, we use the equation:

$\lambda=\frac{c}{\nu}$

where,

$\lambda$ = wavelength of the light = ?

c = speed of x-ray= $3.0\times 10^8m/s$

$\nu$ = frequency of x-ray = $3.0\times 10^{12}MHz=3.0\times 10^{18}Hz= 3.0\times 10^{18}s^{-1}$ $(1Hz=1s^{-1})$

Putting in the values:

$\lambda=\frac{3.0\times 10^8m/s}{3.0\times 10^{18}s^{-1}}=10^{-10}m$

Thus the wavelength of the x-ray wave is $10^{-10}m$

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3 years ago

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2 years ago

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Answer the following stoichiometry question:

labwork [276]

Answer:

Mass = 684.2 g

Explanation:

Given data:

Moles of Aluminium = 25.36 mol

Mass of Al = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Mass = number of moles × molar mass

Molar mass of Aluminium = 27 g/mol

Now we will put the values:

Mass = 25.36 mol × 26.98 g/mol

Mass = 684.2 g

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3 years ago