( (0.1095 mmol/mL)(25 mL) - (0.1482 mmol/mL)(29.04 mL) ) / ( (1000 mg/g)(1.3010 g) )
what is the answer
i got -.0012 but its wrong
Something is wrong with what you are trying to calculate. The first term has dimensions of millimoles and the second term has dimensions of millimoles/mg. That cannot happen in a scientific calculation. I suspect your formula is wrong.
To help you understand and correct your calculation, let's break it down step by step.
In the expression you provided:
((0.1095 mmol/mL)(25 mL) - (0.1482 mmol/mL)(29.04 mL)) / ((1000 mg/g)(1.3010 g))
First, let's simplify each term individually:
First term: (0.1095 mmol/mL)(25 mL)
To obtain the result, multiply the values together:
(0.1095 mmol/mL)(25 mL) = 2.7375 mmol
Second term: (0.1482 mmol/mL)(29.04 mL)
Again, multiply the values to get the result:
(0.1482 mmol/mL)(29.04 mL) = 4.3011808 mmol
Now, let's substitute the simplified terms back into the overall expression:
(2.7375 mmol - 4.3011808 mmol) / ((1000 mg/g)(1.3010 g))
Next, let's combine the simplified terms within the parentheses:
(2.7375 mmol - 4.3011808 mmol) = -1.5636808 mmol
Finally, substitute this value back into the overall expression:
-1.5636808 mmol / ((1000 mg/g)(1.3010 g))
Now, let's simplify the right side of the expression:
(1000 mg/g)(1.3010 g) = 1301 mg
Substituting this value back into the expression:
-1.5636808 mmol / 1301 mg
We need to convert millimoles to moles and milligrams to grams before dividing:
-0.0015636808 mol / 1.3010 g
Now, divide these values:
-0.00120115 mol/g
So, the correct answer is -0.00120115 mol/g.
It seems your initial result of -0.0012 (probably rounded to four decimal places) is very close to the correct answer, but please note that the sign is negative.