Cation Name Cation Symbol

A solution has a volume of 250 ml and contains 0.70 mol Nacl what is the molarity

dem82 [27]

First convert mL into liters:

1 L = 1000 mL

250 mL / 1000 = 0.25 L

M = n / V

M = 0.70 / 0.25

M = 2.8 mol/L⁻¹

hope this helps!

5 0

3 years ago

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According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of

Mademuasel [1]

With the advancement of science, electrons seemed to possess both particle and wave nature.
this is called the dual nature where electrons have both particle and wave properties.
earlier it was believed that electrons used to orbit around the nucleus in orbits.
Later it was found that electrons do not have fixed positions, the exact momentum and position of electrons cannot be determined at the same time
therefore the wave mechanical model was introduced which introduced orbitals.

Orbitals are spaces in which electrons are most likely to be found. These regions have the highest probability of an electron being found here.

correct answer is 3) an electron

3 0

4 years ago

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A compound is formed when 12.2 g Mg combines completely with 5.16 g N. What is the percent composition of this compound? Please

Debora [2.8K]

3Mg + N₂= Mg₃N₂
n(Mg)=12,2g÷24,4g/mol=0,5mol-limiting reagentn
(N₂)=5,16g÷28g/mol=0,18mol
n(Mg₃N₂):n(Mg)=1:3, n(Mg₃N₂)=0,166mol, m(Mg₃N₂)=0,166·101,2=16,8g.
%(N)= 2·Ar(N)÷Mr(Mg₃N₂) = 2·14÷101,2=27,66%=0,2766
%(Mg) = 3·Ar(Mg)÷Mr(Mg₃N₂)= 3·24,4÷101,2=72,34% or 100% - 27,66%= 72,34%.

8 0

3 years ago

a television remote control operates at 319 THz, what is the wavelength of the infrared light in nanometers?

AURORKA [14]

Given:

Frequency (ν) = 319 THz

To determine:

The wavelength corresponding to the given frequency

Explanation:

Wavelength (λ) and Frequency(ν) are related as:

λ = c/ν

where c = speed of light = 3*10⁸ m/s

Now:

SI unit of frequency is Hertz (Hz) also expressed as cycles per second

i.e 1 Hz = 1 s⁻¹

1 Terahertz (THz) = 10¹² Hz

therefore the given frequency ν = 319 *10¹² s⁻¹

λ = 3 * 10⁸ ms⁻¹/319 *10¹² s⁻¹ = 940 * 10⁻⁹ m

since 1 nanometer (nm) = 10⁻⁹ m

The wavelength is λ = 940 nm

Ans: The infrared wavelength = 940 nm

7 0

4 years ago

If 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced?

Salsk061 [2.6K]

Answer:

A. 13.5 moles of CO2

B. 4.5 moles of Na3C6H5O7

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3NaHCO3(aq) + C6H8O7(aq) → 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)

A. Determination of the number of mole CO2 produced from the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 reacted to produce 3 moles of CO2.

Therefore, 4.5 moles of C6H8O7 will react to produce = 4.5 x 3 = 13.5 moles of CO2.

From the above calculation, 13.5 moles of CO2 is produced

B. Determination of the number of mole of Na3C6H5O7 produced by the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 produced 1 mole of Na3C6H5O7.

Therefore, 4.5 moles of C6H8O7 will also produce 4.5 moles of Na3C6H5O7.

Therefore, 4.5 moles of Na3C6H5O7 is produced from the reaction.

5 0

3 years ago