Sand and gravel mixture would be easiest to separate based on the size of the particles.
<h3>What are mixtures?</h3>
Mixtures are the composition which can be obtained by the combination of different types of elements.
In the question different types of mixtures are given in which all have same kind of size distribution except sand and gravel. Size of sand is smaller than gravel, so it can be separated by easy physical method like sieving.
Hence, option (d) is correct it means sand and gravel would be easiest to separate.
To know more about mixtures, visit the below link:
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Answer:
0.6257 M is the molarity of solution that is 5.50 percentage by mass oxalic acid.
Explanation:
Mass percentage of oxalic acid = 5.50%
This means that in 100 grams of solution there are 5.50 grams of oxalic acid.
Mass of solution , m = 100
Volume of the solution = V
Density of the solution = d = 1.024 g/mL
V = 97.66 mL = 0.09766 L
(1 mL = 0.001 L)
Moles of oxalic acid =
The molarity of the solution :
0.6257 M is the molarity of solution that is 5.50 percentage by mass oxalic acid.
The molecular weight of an unknown gas is 613.8 kg.
<u>Explanation:</u>
RMS or root mean square velocity is given by the formula,
RMS =
where R is the gas constant = 8.314 kgm²s⁻²K⁻¹mol⁻¹
T is the temperature in Kelvin = 50 + 273 = 323 K
Molar mass of the Nitrogen gas in kg is 0.028 kg/mol
So we can find the RMs of the nitrogen by plugin the above values in the above equation, we will get,
RMS =
= 536.4 m/s
Now we have to take half of RMS as 268.2 m/s
Now we have to rearrange the equation to get M as,
M =
Now the temperature is T = 130 + 273 = 403 K
Plugin the values as,
M =
= 613.8 kg/mol
So the molecular weight of an unknown gas is 613.8 kg.
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