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3 years ago

A solution of potassium chlorate, KCIO3, has 20 grams of the

Chemistry

1 answer:

natima [27]3 years ago

7 0

C) 10 grams

Explanation:

Potassium chlorate (KCIO₃) have a solubility in water at 70 °C of 30 grams in 100 grams of water.

If our solution have already 20 grams of potassium chlorate salt dissolved that means we need another 10 grams of potassium chlorate to reach the saturation point.

Learn more:

Potassium chlorate solubility in water

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What is the pressure of 0.5 mol of nitrogen gas in a 5 L container at 203 K

Ivan

Answer:

1.67 atm.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 5.0 L).

n is the no. of moles of the gas in mol (n = 0.5 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 203 K).

∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(203 K)/(5.0 L) = 1.67 atm.

3 0

3 years ago

What is the simplest whole number ratio of atoms in a molecule or formula unit called?

astra-53 [7]

The empirical formula

7 0

3 years ago

What would barium do to obtain a noble gas structure? gain 2 electrons lose 2 electrons gain 6 electrons lose 6 electrons

Tema [17]

Answer:

Lose two electrons.

Explanation:

Barium is present in group 2.

It is alkaline earth metal.

Its atomic number is 56.

Its electronic configuration is Ba₅₆ = [Xe] 6s².

In order to attain the noble gas electronic configuration it must loses its two valance electrons.

When barium loses it two electron its electronic configuration will equal to the Xenon.

The atomic number of xenon is 54 so barium must loses two electrons to becomes equal to the xenon.

4 0

3 years ago

Determine the frequency of radiation whose wavelength is 7.67 x 10^-7 cm. Then, determine the amount of energy in the radiation.

dimulka [17.4K]

Answer:

They frequency = 3.9 * 10^16 Hz

The amount of energy E = 2.58 *10^-17 J

Explanation:

Step 1: Data given

wavelength is 7.67 * 10^-7 cm

Step 2: Calculate the frequency

f = c / λ

⇒ with λ = the wavelength in nm = 7.67 nm

⇒ with c = the speed of light = 3.00 * 10^8 m/s

⇒ f = the frequency = TO BE DETERMINED

f = (3.00 * 10^8 m/s) / 7.67 * 10^-9 m

f = 3.9 * 10 ^16 /s = 3.9 * 10^16 Hz

They frequency is 3.9 * 10^16 Hz

Step 3: Calculate the amount of energy

E = h *f

⇒ with E = the amount of energy (in joule)

⇒ h = Planck's constant = 6.626 *10^-34 J*s

⇒ with f = the frequency

E = 6.626 *10^-34 J*s * 3.9 * 10^16 Hz

E = 2.58 *10^-17 J

8 0

3 years ago

What is the wavelength of electromagnetic radiation with a frequency of 9.23 × 107 Hz?

Igoryamba

Answer:

The wavelength of the given electromagnetic radiation is 3.25 m.

Explanation:

We know that,

Frequency (f) = c / λ;

where,

c - speed of light = $3\times10^{8} m/s$

λ - wavelength of the radiation.

Given,

f = $9.23 \times10^{7} Hz$ ,

From the above formula,

λ = $\frac{c}{f}$

λ = $\frac{3\times10^{8} }{9.23\times10^{7} }$

λ = 3.25m;

Therefore,

Wavelength of the given radiation = 3.25 m

3 0

4 years ago