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3 years ago

What is the mass of one electron in grams if an electron has the charge of

Chemistry

1 answer:

vazorg [7]3 years ago

3 0

The mass of one electron : 9.103 x 10⁻²⁸ g

<h3>Further explanation</h3>

Electrons are a part of the atomic nucleus particles (including protons and neutrons), and are negatively charged (-1)

An electron has the charge of -1.6022 x 10⁻¹⁹C

1 g = -1.76 x 10⁸ C

so the mass of one electron :

$\tt \dfrac{1.6022\times 10^{-19}}{1.76\times 10^8}=9.103\times 10^{-28}~g$

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In the following chemical reaction between H_2 and Cl_2 to produce HCl, what is the sum of the mass of HCl produced plus the mas

Nonamiya [84]

Answer:

Left over mass of hydrogen = 0.06 g

Mass of HCl produced = 12.41 g

Explanation:

Given data:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Solution:

Chemical equation:

H₂ + Cl₂ → 2HCl

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

Now we will compare the moles of HCl with H₂ and Cl₂.

H₂ : HCl

1 : 2

0.2 : 2×0.2 = 0.4

Cl₂ : HCl

1 : 2

0.17 : 2 × 0.17 = 0.34

Chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:

Cl₂ : H₂

1 : 1

0.17 : 0.17

Number of moles of H₂ react with Cl₂ are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

Mass = number of moles × molar mass

Mass = 0.03 mol × 2 g/mol

Mass = 0.06 g

6 0

3 years ago

What is the total number of atoms in the following formula?<br>CaBr2

Furkat [3]

Answer:

Three

Explanation:

Ca= 1 atom

And Br2 stands for 2 Br atoms

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poizon [28]

Answer:

There are

Explanation:

There are 10 elements in CH3CH2COONa.

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10 m/s to 80 m/s in 5 seconds

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Question 22 A VHF television station assigned to channel transmits its signal using radio waves with a frequency of . Calculate

aleksklad [387]

The question is incomplete, here is the complete question:

A VHF television station assigned to channel transmits its signal using radio waves with a frequency of 66.0 MHz. Calculate the wavelength of the radio waves. Round your answer to 3 significant digits.

Answer: The wavelength of the radio waves is 4.54 m

<u>Explanation:</u>

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

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

where,

$\lambda$ = wavelength of the light

c = speed of light = $3\times 10^8m/s$

$\nu$ = frequency of light = $66.0MHz=66.0\times 10^6s^{-1}$

Putting the values in above equation, we get:

$\lambda=\frac{3\times 10^8m/s}{66.0\times 10^{6}s^{-1}}=4.54m$

Hence, the wavelength of the radio waves is 4.54 m

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4 years ago