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3 years ago

What is the molarity of a kf(Aq) solution containing 116 g of kf in 1.00 l of solution

Chemistry

1 answer:

Oduvanchick [21]3 years ago

8 0

Answer:

2.00 M

Explanation:

K=39 F=19

39+19=58

116/58= 2 mol/ 1 L = 2 M

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Use the table to identify the phase and phase changes of the elements under the given conditions. Write the name of the substanc

Lana71 [14]

Answer: gallium, condenses, gas

Explanation: took assignment on edge

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3 years ago

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A self-contained underwater breathing apparatus (SCUBA) uses canisters containing potassium superoxide. The superoxide consumes

Mrac [35]

Answer:

52.0004 grams of mass of potassium superoxide is required

Explanation:

Let moles carbon dioxide gas be n at 22.0 °C and 767 mm Hg occupying 8.90 L of volume.

Pressure of the gas,P = 767 mm Hg = 0.9971 atm

Temperature of the gas,T = 22.0 °C = 295.15 K

Using an ideal gas equation to calculate the number of moles.

$PV=nRT$

$n=\frac{0.9971 atm\times 8.90 L}{0.0821 atm L/mol K\times 295.15 K}$

n = 0.3662 mol

$4KO_2(s)+2CO_2(g)\rightarrow 2K_2CO_3(s)+3O_2(g)$

According to reaction, 2 moles of carbon-dioxide reacts with 4 moles of potassium superoxide.

Then 0.3662 mol of of carbon-dioxide will react with:

$\frac{4}{2}\times 0.3662 mol=0.7324 mol$ of potassium superoxide.

Mass of 0.7324 mol potassium superoxide:

0.7324 mol × 71 g/mol = 52.0004 g

52.0004 grams of mass of potassium superoxide is required.

8 0

3 years ago

What is an atom that has the same number of protons as other atoms of the same element, but has a different number of neutrons?

PSYCHO15rus [73]

Answer:

isotopes

Atoms with the same number of protons but different numbers of neutrons are called isotopes. Because the number of neutrons can vary for a given element, the mass numbers of different atoms of an element may also vary. For example, some helium atoms have three neutrons instead of two (these are called isotopes and are discussed in detail later on)

Explanation:

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3 years ago

Need help !!!!! ASAP

Julli [10]

<h2>Hello!</h2>

The answer is:

The new volume will be 1 L.

$V_{2}=1L$

To solve the problem, since we are given the volume and the first and the second pressure, to calculate the new volume, we need to assume that the temperature is constant.

To solve this problem, we need to use Boyle's Law. Boyle's Law establishes when the temperature is kept constant, the pressure and the volume will be proportional.

Boyle's Law equation is:

$P_{1}V_{1}=P_{2}V_{2}$