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2 years ago

How many protons, neutrons, and

Chemistry

1 answer:

Alexus [3.1K]2 years ago

7 0

Your answer is 4 protons 4 electrons and 5 neutrons

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If 28 mL of 6.2 M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?

Naddika [18.5K]

Answer:

The answer is 30 g of sodium hydrocarbonate

Explanation:

This is a acid-base reaction, so in order to neutralise the spilled acid, the mol of spilled acid should be calculated.

M = n / V => n = M x V = 0.028 x 6.2 = 0.1736 mol

Since 1 mol of sulfuric acid generates 2 mol of H⁺, so the mole of H⁺ is 0.3472 mol or 0.35 mol with two significant figures.

To neutralized the acid, we need at least the same mole of base, so we need at least 0.35 mol of NaHCO₃, which can be converted to its mass at 29.4 g.

Since the answer need to be expressed in two significant figures and also need to make sure to neutralize all the acid, so we will use a little excess base. The answer is 30 g.

5 0

3 years ago

What is the mass (g) of 500.ml water if the density is 0.9901 g/ml?

kow [346]

Explanation:

Mass = Density × Volume

where volume = 500ml and....

Density = 0.9901 g/ml

Mass = 0.9901 × 500

Mass = 495.05 g

3 0

4 years ago

Raw one valid lewis structure (including all lone pair electrons and any formal charges) for ch2n2. Assume the atoms are arrange

Alex

In the trial structure (1st image below), every atom has an octet.

Valence electrons = 20

Valence electrons available = 4 + 2 +10 = 16

The trial structure has 4 electrons too many. The actual structure must have two double bonds or one triple bond.

The second image shows two possible Lewis structures.

8 0

3 years ago

Some instruments differentiate individual quanta of electromagnetic radiation based on their energies. assume such an instrument

bulgar [2K]

Answer:

5.68×10¯¹⁰ m

Explanation:

From the question given above, the following data were obtained:

Energy (E) = 3.50×10¯¹⁶ J

Wavelength (λ) =?

Energy (E) and wavelength (λ) are related according to the following formula:

E = hv/λ

Where

E => is the energy

h => is the Planck's constant

v => is the velocity of electromagnetic radiation

λ => is the wavelength of the radiation.

With the above formula, we can obtain the wavelength of the radiation as follow:

Energy (E) = 3.50×10¯¹⁶ J

Planck's constant (h) = 6.63×10¯³⁴ Js

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

E = hv/λ

3.50×10¯¹⁶ = 6.63×10¯³⁴ × 3×10⁸ / λ

3.50×10¯¹⁶ = 1.989×10¯²⁵/ λ

Cross multiply

3.50×10¯¹⁶ × λ = 1.989×10¯²⁵

Divide both side by 3.50×10¯¹⁶

λ = 1.989×10¯²⁵ / 3.50×10¯¹⁶

λ = 5.68×10¯¹⁰ m

Thus, the wavelength of the radiation is

5.68×10¯¹⁰ m

7 0

3 years ago

Salts should generally be soluble in nonpolar organic solvents. a. True b. False

Rashid [163]

I think its A but im not completely sure.

3 0

3 years ago

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