# Maths chemistry question help

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#1
Can anyone help me with these questions:

Before analysis, a blood sample is diluted 1:5 with saline. When analysed, the diluted blood sample is shown to contain 53040 white blood cells in 10µl. What is the WBC count in 1ml of the undiluted blood?

A disinfectant is used to clean the floor of a ward (12.5m long by 8.m wide) at a working concentration of 1.5g/L. To be effective, the disinfectant should be delivered at 0.2g/m2. How many litters of disinfectant would you need to effectively clean the floor of this ward? Give your answer to the nearest 0.5L.

Last edited by futureisall; 4 weeks ago
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4 weeks ago
#2
1000ul in 1ml 10ul x 100 =1ml 53040 x 100 = 5304000 WBC
diluted = 1:5 1+5=6 5304000/6 =884000 WBC
i think thats how you do the first one.
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