Molecules

The optimal level of fluoride in drinking water suggested by the World Health Organization in 1994 is between 0.5mg/L and 1.0mg/L. How many moles of sodium fluoride would have to be added to pure... more

In 2001, the annual global production of hydrogen sulfate (mainly in the form of sulfuric acid) was 165 million tonnes. [1 tonne is defined as 1000 kg] Determine the number of MOLECULES of hydrogen... more

Seven moles of calcium hydroxide has_____ number of Molecules i was told the answer is 42.16*10^23 how did they get that as the answer? Thank you

A. 1,400 mil h2oB. 5.2x10^50 mol h2oC. 1.4 mol h20 D. 1.4x10^51 mol h2o

What kind of bond holds a water molecule together?

i know that Zinc is one of the metals cations, but i don't know if it's a transition metal too. I asked my professor once and he preferred the second one Zinc(||) Hydroxide, but after i researched... more

I'm having trouble answering the following questions: “where would you find hydrogen bonds in nucleic acids?” “where would you find hydrogen bonds in carbohydrates”?

The natural abundance of 2H is 0.015% and that of 18O is 0.20%. How many 2H218O molecules are there in 1.0 moles of water?

I drew a Lewis Structure of ClO3- with 3 double bonds instead of 2 and 1 single bond but I'm wondering if it is a valid structure.  Is there a maximum amount of double bonds that Cl can make?

Please tell me the answer to the question 

if there is a representation of a molecule found in mothballs, is it unsaturated, an aromatic compound, a hydrocarbon or all of these.   the molecule   has 6 sides with a circle in it.  Cl is at... more

i understand that biological molecules can bind to each other forming the weak bonds and that they can mimic other molecules  but I don't see the importance In the 3D shapes 

1. X (Two dots at top) 2. X (Dots all around except on right, only has one instead of two) 3. X (One on the right) 4. X (Dots all around except on left, only has on instead of two)