3 years ago

Density is mass per I'm it of volume. Which pair of lab instruments would a student use to measure the density of a seawater

Chemistry

1 answer:

kati45 [8]3 years ago

5 0

Density can be measured by D=Volume/mass

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3 years ago

How much heat is released as the temperature of 465 g of water drops from 75.0°C to 18.2°C?

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The heat released : -110560.632 J

<h3>Further explanation</h3>

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

<h3>Known</h3>

m =465 g

c water = 4.186 J/gram °C

∆T = temperature difference = 18.2 - 75 = - 56.8 °C

Then the heat :

$\tt Q=m.c.\Delta T\\\\Q=465\times 4.186\times -56.8\\\\Q=\boxed{\bold{-110560.632~J}}\rightarrow -=exothermic$

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