Chemistry, 25.01.2020 01:31 Gearyjames8

In the minnesota department of health set a health risk limit for methanol in groundwater of 4.00 μg. suppose an analytical chemist receives a sample of groundwater with a measured volume of 76.0 ml.
calculate the maximum mass in milligrams of methanol which the chemist could measure in this sample and still certify that the groundwater from which it came met minnesota department of health standards. be sure your answer has the correct number of significant digits.

Answers: 1

Show answers

Answers

Answer from: lethycialee79711

The question is incomplete, here is the complete question:

In the Minnesota Department of Health set a health risk limit for methanol in groundwater of 4.00 μg/L. Suppose an analytical chemist receives a sample of groundwater with a measured volume of 76.0 mL.

Calculate the maximum mass in milligrams of methanol which the chemist could measure in this sample and still certify that the groundwater from which it came met Minnesota Department of Health standards. Be sure your answer has the correct number of significant digits.

The risk limit of methanol in the given amount of methanol is $3.04\times 10^{-4}mg$

Explanation:

We are given:

Risk limit for methanol in groundwater = 4.00 μg/L = 0.004 mg/L (Conversion factor: $1mg=1000\mu g$ )

Volume of groundwater that is to be measured = 76.0 mL

We know that:

1 L = 1000 mL

Applying unitary method:

In 1000 mL of groundwater, the risk limit of methanol is 0.004 mg

So, in 76.0 mL of groundwater, the risk limit of methanol will be = $\frac{0.004}{1000}\times 76.0=3.04\times 10^{-4}mg$

Hence, the risk limit of methanol in the given amount of methanol is $3.04\times 10^{-4}mg$

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

Answer from: Quest

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.