Astudent places 15.0 ml of water in a graduated cylinder. she then places an object with an
into the same cylinder. the final volume now reads 20.0 ml
a. what is the volume of the unknown object?
. if the object has a mass of 23 g, what is its density to one decimal place? do not forget units. (density
mass/volume)

d = 4.6 g/mL

Explanation:

Volume of water = 15.0 mL

Final volume after placing object = 20.0 mL

Volume of object = ?

Mass of object = 23 g

Density of object = ?

Solution:

Volume of object = Total volume - volume of water

Volume of object = 20.0 mL - 15.0 mL

Volume of object = 5.0 mL

Density of object:

density = mass/ volume

d = m/v

d = 23 g/ 5.0 mL

d = 4.6 g/mL

h let me think

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.