Answer:
5.46 M
Explanation:
First, we need to know the molar mass of the citric acid, the molar masses of the elements are:
H = 1 g/mol
C = 12 g/mol
O = 16 g/mol
So the molar mass of the acid is: 8x1 + 6x12 + 7x16 = 192 g/mol
The mass of the acid is the number of moles multiplied by the molar mass, so:
m = 0.688x192 = 132.096 g
Then, the volume is the mass divided by the concentration:
V = 132.096/1.049 = 125.926 mL = 0.1259 L
So, the molar concentration is the number of moles divided by the volume in liters:
M = 0.688/0.1259
M = 5.46 M
In the first chart (NH4)2SO4
Nitrogen is 2
Hydrogen is 8 (h4*2)
Sulfur is 1
Oxygen is 4
For the second chart
Nitrogen i believe is 2
Hydrogen would be 10
Sulfur would should 1
and Oxygen should be 4
I believe that the best answer for this question is that the scanning tunneling microscope allowed scientists to create pictures of individual atoms. The scanning tunneling microscope is able to image surfaces' atoms. Its invention in 1981 was so monumental that it led to its creators winning the Nobel Prize in Physics. Hope this helps.
I used to know this. I don't really remember but is used to know it. Im in 6th grade now
Density = 7.90 g/cm³
volume = 1.00 cm³
Therefore:
mass = density * volume
mass = 7.90 * 1.00
mass = 7.90 g