Assume that the test tube shown in the transparency
started out having 15.00 g of
mercury(II) oxide. After heating
the test tube, you find no
mercury(II) oxide left and 1.11 g
of oxygen gas.
What mass of liquid mercury
was produced by the
chemical reaction? Show your
work.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

the answer to your question is c.

if you read the house of usher you should know that the house was haunted