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Kamila [148]
3 years ago
12

Assume that you have to prepare a 200 g salt solution, and the concentration must be 15 % by mass. How many grams of solute and

water you must mix together.
Chemistry
1 answer:
Marrrta [24]3 years ago
3 0

Answer:

170 g

Explanation:

w/w% concentration = mass of solute/ mass of solution * 100

mass of solute = x

mass of solution = 200 g

w/w% concentration =  15 % by mass

15 = x/200 * 100

15 = 100x/200

200 * 15 = 100x

x = 200 * 15/100

x = 2 * 15

x = 30g

But mass of solution = mass of solute + mass of solvent

mass of solute = 30g

mass of solvent = mass of solution  - mass of solute

mass of solvent = 200 g - 30 g

mass of solvent = 170 g

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The half-life of plutonium-238 is 87.7 years.
Margaret [11]

Answer:

263.1 is exactly three half-life, so the remaining portion is (1/2 x 1/2 x 1/2) of the original sample. That's 1/8 which is 12.5%

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3 years ago
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The reaction 2 no(g) + cl2(g) → 2 nocl(g) is carried out in a closed vessel. if the partial pressure of no is decreasing at a ra
BARSIC [14]

Answer:

92.0 torr/min.

Explanation:

  • For the reaction: <em>2NO(g) + Cl₂(g) → 2NOCl(g).</em>

∵ The rate of the reaction = - 1/2(ΔP)NO/Δt = - (ΔP)Cl₂/Δt = 1/2(ΔP)NOCl/Δt.

∵ (ΔP)NO/Δt = - 184 torr/min.

<em>∴ The rate of change of the total pressure in the vessel = - 1/2(ΔP)NO/Δt</em> = (- 1/2)(- 184 torr/min) = <em>92.0 torr/min.</em>

4 0
4 years ago
To convert from °C to K: T(K) = T(°C) + 273.15
Aleksandr-060686 [28]

Answer:

Yes! That is correct.

Explanation:

0°C = 273.15 K, so in order to convert from Celsius degrees (°C) to Kelvin (K) you have to add 273.15 to the value in Celsius degrees.

3 0
3 years ago
What is the most stable monatomic ion formed from fluorine
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A fluorine element has 7 valence electrons.

A stable fluorine ion should have 8 valence electrons.

So fluorine gains an extra electron.

Thus, the most stable monatomic ion is F^{-}

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At 570 mm hg and 25 c a gas sample has a volume of 2270 ml what is the final pressure at a volume of 1250 ml?
ValentinkaMS [17]

Main Answer:

Given data:

Initial Pressure P1 = 570 mm hg

Initial Volume V1 = 2270 ml

Final Pressure P2 = ? mm hg

Final Volume V1 = 1250 ml

According to the ideal gas equation,

PV = constant.

P1V1 = P2V2

P2 = P1V1/V2

P2 = (570 x 2270) / 1250

P2 = 1035.12 mm hg

The final pressure at volume of 1250 ml is 1035.12 mm hg.

Explanation:

What is ideal gas equation ?

The ideal gas equation is as follows:

PV = nRT

where P = Pressure

V = Volume

n = number of moles of gas

R = Universal gas constant

T = Temperature

This ideal gas equation provides the macroscopic particles behavior of the gas. At this condition, the particles of the gas, won't be attract or repel each other. It is consider as the stable condition.

To know more about ideal gas equation, please visit:

brainly.com/question/21912477

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