The density of water is 1.00 g/mL at 4°C. How many water molecules are present in 2.66 mL of water at this temperature?

2.46 mL

Explanation: Becuase here you see that you need to use the density of water at  

4 ∘ C

and the volume of the sample to find its mass, then use water's molar mass to find how many moles of water you get in this sample. SO HOPE THIS HELPS

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

what does the table look like