You have to find the density of the above, irregularly shaped object: When this plastic toy is measured with a ruler, it is 7.23 cm in height, 5.20 cm wide and 2.25 cm deep. The toy is dropped into a graduated cylinder containing water to a level of 23.9 mL, and it sinks, raising the meniscus to 60.5 mL. Calculate the volume of the toy in mL. Report your answer with units and the correct number of significant digits. g

5.20

Explanation:

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error