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3 years ago

Atomic mass is calculated by adding and

Chemistry

1 answer:

Lisa [10]3 years ago

6 0

By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom

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Which of the following is the correct name for the compound HF? Hydrogen floride hydrogen monofloride Hydroflorous acid Hydroflo

Nataliya [291]

Answer: The correct answer is Hydrogen Fluoride.

4 0

3 years ago

How can I calculate the valence electrons of ions?

DIA [1.3K]

First of all, you should know the valence electron of atom.

Then add charge, In case of -ve ion & subtract, in case of +ve ion.

8 0

3 years ago

The production of ammonia (NH3) under standard conditions at 25°C is represented by the following thermochemical equation. N2(g)

asambeis [7]

Answer:

44,901 kilo Joule heat is released when $1.663\times 10^4 g$ grams of ammonia is produced.

Explanation:

Moles of ammonia gas produced :

$\frac{1.663\times 10^4 g}{17 g/mol}=978.235 mol$

According to reaction, when 2 moles of ammonia are produced 9.18 kilo joules of energy is also released.

So, When 978.235 moles of ammonia gas is produced the energy released will be:

$\frac{-91.8 kJ}{2}\times 978.235 mol=-44,900.98 kJ\approx -44,901 kJ$

(negative sign indicates that energy is released as heat)

44,901 kilo Joule heat is released when $1.663\times 10^4 g$ grams of ammonia is produced.

7 0

3 years ago

Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to b

Kamila [148]

Answer:

344 nm is the longest wavelength of radiation with enough energy to break carbon-carbon bonds.

Explanation:

$C-C(g)\rightarrow 2C(g)$ ,ΔH = 348 kJ/mol

Energy required to break 1 mole of C-C bond = 348 kJ

Energy required to break 1 C-C bond = E

$E = \frac{348,000J}{6.022\times 10^{23}}=5.779\times 10^{-19} J$

Energy related with the wavelength of light is given by Planck's equation:

$E=\frac{hc}{\lambda }$

$\lambda =\frac{hc}{E}$

$=\frac{6.626\times 10^{-34} Js\times 3\times 10^8 m/s}{5.779\times 10^{-19} J}$

$\lambda =3.44\times 10^{-7} m = 344 nm$

$1 m =10^9 nm$

344 nm is the longest wavelength of radiation with enough energy to break carbon-carbon bonds.

5 0

4 years ago

HNO3 is an Arrhenius blank and increases the concentration of blank when added to water

BartSMP [9]

Maybe it's [Acid] and [H+ ions]

8 0

3 years ago