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s344n2d4d5 [400]
4 years ago
5

The change of one or more substancss into other substance​

Chemistry
1 answer:
SSSSS [86.1K]4 years ago
3 0

Answer:

lol what? bruh you need to explain what your talking about im in an ap class i can help

Explanation:

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Hoeveel gram opgeloste stof moet je afwegen om 250 ml KMnO4-oplossing te bereiden met een concentratie van 0,500 mol / L
Hatshy [7]

How many grams of solute do you have to weigh to prepare 250 ml KMnO4 solution with a concentration of 0.500 mol / L

Answer:

19.75g

Explanation:

Given parameters:

Volume of KMnO₄  = 250mL or 0.25L

Concentration of solution  = 0.5mol/L

Unknown:

Mass of solute or  KMnO₄ = ?

Solution:

To solve this problem, we need to find the number of moles first.

 Number of moles  = Concentration  x volume

 Number of moles  = 0.5mol/L x 0.25L  = 0.125mol

So;

   Mass in grams  = number of moles x molar mass

 Molar mass of  KMnO₄ = 39 + 55 + 4(16)  = 158g/mol

   Mass in grams  = 0.125 x 158  = 19.75g

7 0
3 years ago
Read 2 more answers
A sample of gas occupies 115.9 mL at -206.6°C. What volume does the sample occupy at 175.9 °C?
aniked [119]
Charles law gives the relationship between volume of gas and temperature.
It states that for a fixed amount of gas at constant pressure, volume of gas is directly proportional to the temperature.
\frac{V}{T} = k

where V - volume and T - temperature and k - constant 
\frac{V1}{T1} =  \frac{V2}{T2}
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in Kelvin , -206.6 °C + 273.15 = 66.55 K
T2 - 175.9 °C + 273.15 = 449.05 K
substituting the values in the equation 
\frac{115.9 mL}{66.55 K} =  \frac{V}{449.05 K}
V = 782 mL
the new volume is 782 mL
3 0
3 years ago
Term used by geologists for water that soaks into the ground, fills the openings in the soil, and trickles into cracks and space
erastova [34]

GROUNDWATER is the term used for water that soak into the ground, fills the openings in the soil and trickles into cracks and spaces in rock layers.

Groundwater is usually found underneath the earth surface in the spaces and cracks in sand, rock and soil. It is stored in aquifers. Ground water usually connect with various water bodies such as oceans, rivers and streams and it is always a natural source of water for vegetation. Ground water is a very important natural resource.

7 0
4 years ago
Read 2 more answers
A bow and arrow that was just pulled back but not yet released has
GREYUIT [131]

Answer:

A potential

Explanation:

potential energy is a kind of energy which rest or stays in one position

7 0
3 years ago
which of the following describes how ice could have once covered warm places such as australia and india
4vir4ik [10]

Answer:

U shaped vallies?

Explanation:

(i dont know if this was one of the options)

6 0
3 years ago
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