Daniella prepares a 1 mg/ml 1 mg/ml myoglobin solution. The molecular weight of myoglobin is 17.8 kDa. 17.8 kDa. Given that the ϵ ϵ of myoglobin is 15 , 000 M − 1 cm − 1 , 15,000 M−1cm−1, calculate the absorbance of the myoglobin solution across a 1 cm 1 cm path. Calculate your answer to two decimal places.

A = 0.84

Step-by-step explanation:

The absorbance of the myoglobin solution can be calculated by using the Beer-Lambert law:

Where:

A: is the absorbance

ε: is the molar attenuation coefficient = 15,000 M⁻¹cm⁻¹

l: is the  optical path length = 1 cm

C: is the concentration = 1 mg/ml  

Since the concentration is given in mg/ml and the molar attenuation coefficient is given in M (mol/L) we need to convert the concentration in mg/ml to mol/L and for that, we need to use the molecular weight of myoglobin = 17.8 kDa = 17.8x10³ g/mol:    

Now, we can calculate the absorbance of the myoglobin:

Therefore, the absorbance of the myoglobin solution is 0.84.

I hope it helps you!  

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.