Answer:
m = 4.7 μg
Explanation:
Given data:
density of acetone = 60.0 μg/L
Volume = 79.0 mL
Mass = ?
Solution:
Formula:
d = m/v
v = 79.0 mL × 1L /1000 mL
v = 0.079 L
Now we will put the values on formula:
d = m/v
60.0 μg/L = m/0.079 L
m = 60.0 μg/L × 0.079 L
m = 4.7 μg
So health risk limit for acetone = 4.7 μg
Answer:
C2H6N2O
Explanation:
Mass of carbon = 12g /44g/mol * 5.134 g = 1.4 g
Number of moles of carbon= 1.4 g/12g/mol = 0.12 moles
Mass of hydrogen = 2 g/18g/mol * 3.173 g = 0.35 g
Number of moles = 0.35 g/1 g/mol = 0.35
Mass of nitrogen= 37.82/100 * 4.319 g = 1.6 g
Number of moles = 1.6 g/14g/mol = 0.11
Mass of oxygen = (4.319) - (1.4 + 0.35 + 1.635) = 0.934 g
Number of moles = 0.934 g/16 g/mol = 0.058 moles
The lowest ratio is 0.058
Dividing through;
C- 0.12/0.058 = 2
H - 0.35 / 0.058= 6
Nitrogen - 0.11/0.058 = 2
O- 0.058 moles/0.058 = 1
Hence he empirical formula is;
C2H6N2O
The mass is simply the product of volume and density. But
first, let us convert the volume into cm^3 (cm^3 = mL):
volume = 2.5 cups * (240 mL/cup)
volume = 600 mL = 600cm^3
So the mass is:
mass = 600 cm^3 * (1 g / cm^3)
<span>mass = 600g</span>
An electron configuration that is farther away from 8 or 1, an electron valence that is either closer to 8 or 1 will become less stable. This is because they will either by trying hard to loose an electron to have a full 8 or gain one to become. Full 8 valence
Galaxies are the lump of matter. The shape of major galaxies is spiral shape. Thus, the given statement is false.
<h3>What are the shapes of galaxies?</h3>
The galaxies are the lump of dust and mass, held together by the gravitational force. The galaxies are continuously moving in the universe.
The formation of galaxies is believed to be due to the force of attraction between the components.
The shape of major galaxies is assumed to be spiral-shaped, however, the irregular shape galaxies are also present.
Thus, the given statement about the shape of galaxies is false.
Learn more about galaxies, here:
brainly.com/question/2905713