The mass of a 270. mL beaker is 178 g when empty. Determine its mass when filled
ID: 883136 • Letter: T
Question
The mass of a 270. mL beaker is 178 g when empty. Determine its mass when filled with the following substances.
(a) water (density 0.9970 g/cm3 at 20°C)
____ g
(b) alcohol (density 0.7893 g/cm3 at 20°C)
____ g
(c) mercury (density 13.546 g/cm3 at 20°C)
____ g
(d) Explain why mercury containing pollutants are usually found in the mud at the bottom of a lake of stream.
-Mercury has a negative charge and is attracted to the positively charged particles on the lake or stream bed.
-Mercury containing pollutants do not float.
-Mercury is denser, and therefore sinks to the bottom of the lake or stream.
Explanation / Answer
a) empty volume = 270 ml
density of water = 0.9970 g/ml
mass of water = density x volume
= 0.9970 x 270
= 269.19 g
total mass = mass of water + mass of beaker
= 269.19 + 178
= 447.19g
when water filled total mass = 447.19g
(b) density 0.7893 g/cm3
alcohol weight = 270 x 0.7893= 213.11g
total weight = 213.11 + 178
= 391.11
total weight = 391.11g
(c) mercury weight = 13.546 x 270
= 3657.42
total weight = 3657.42 + 178
= 3835.42 g
(d) correct answer : Mercury is denser, and therefore sinks to the bottom of the lake or stream.
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