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Amiraneli [1.4K]
3 years ago
10

How many g of MgCO3(s) are needed to make 1.2 L of 1.5 M MgCl2(aq) solution?

Chemistry
1 answer:
maw [93]3 years ago
4 0
Molar mass of MgCO3 is 84.313 g/mol
You can calculate this from data on the periodic table:
Molar mass Mg = 24.305g/mol
molar mass C = 12.011g/mol
molar mass O = 15.999g/mol mass 3 mol = 47.997g
Total = 84.313g/mol

Mass to be used in 1.2L of 1.5M solution = 84.313g * 1.2L * 1.5mol /L = 151.763g
I have not taken significant figures into account
The balanced equation you provide is not necessary in this calculation
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2 years ago
Calculate the heat absorbed by the water in a calorimeter when 175 grams of lead cools from 125.0°C to 22.0°C. The specific heat
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Answer:

Q = 233.42 J

Explanation:

Given data:

Mass of lead = 175 g

Initial temperature = 125.0°C

Final temperature = 22.0°C

Specific heat capacity of lead = 0.01295 J/g.°C

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Solution:

Heat  absorbed by water is actually the heat lost by the metal.

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Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

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