Need serious science hw help please

+1 vote
This is for a big grade help i really need it the question is. You put 2 drops of water, each with a mass of 0.42 g onto a piece of paper and tip the paper so they roll into each other and form a single blob. The average atomic mass for water is 18. Write answers to the following questions.

What is the mass of the water blob after the collision?
How many Moles of water are there in the blob?
How many water molecules are there in the blob?
asked Jan 3, 2012 in Science by anonymous

2 Answers

0 votes
The water blob will be .84g after the collision. A .84g water blob will have .04666moles. It will have 2.810x10^22 water molecules
answered Jan 4, 2012 by anonymous
0 votes
For the most part the answer for part 2 and 3 are just simple stoichemiotry. After you find the mass of the water blob (which is essentially just multipyling mass of one by 2) knowing the atomic mass to be 18 you can easily set-up an equation and solve for the other 2 parts of the equation.  If you need more help ask.
answered Jan 4, 2012 by pokemonmaster ~Expert~ (3,854 points)

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