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3 years ago

What sort of fossils have been found in Antarctica from about the time of Pangaea (250 MYA)?

Chemistry

1 answer:

Umnica [9.8K]3 years ago

6 0

Answer:

Lystrosaurus

Explanation:

Lystrosaurus, a vegetarian dinosaur whose name apparently means "trowel dinosaur," inhabited the area in the earliest Triassic period, 220 million years. It is believed to be have been herbivorous which developed to be around one meter long, with an average build similar to a pig. Lystrosaurus skeletons have only been discovered in Antarctic peninsula, India, and Africa.

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If a medicine ball in a gym has a mass of 4.0 Kg, what is its weight?

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4 years ago

The Earth's surface is colder than the air above it, what will happen to the air?

Nitella [24]

Answer:

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Explanation:

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3 years ago

HURRY!!!!!!!!!!!!!!!!!!!!!!!WHAT TYPE OF STORM FORMS WHEN WINDS BEGIN TO ROTATE OVER OCEAN WATER BRINGING HIGH WINDS AND VERY HE

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3 years ago

A solution was prepared by dissolving 28.0g of KCL in 225g of water. Part A Calculate the mass percent ofKCL in the solution. Pa

Westkost [7]

Answer:

A. 11.1%

B. 0.0291

C. 1.57 M

D. 1.67 m

Explanation:

Mass of KCl (solute): 28.0 g

Mass of water (solvent): 225 g

Mass of solution: 28.0 g + 225 g = 253 g

The mass percent of KCl is:

%KCl = (mass of KCl/mass of solution) × 100%

%KCl = (28.0 g/253 g) × 100%

%KCl = 11.1%

The molar mass of KCl is 74.55 g/mol. The moles of KCl are:

28.0 g × (1 mol/74.55 g) = 0.376 mol

The molar mass of water is 18.02 g/mol. The moles of water are:

225 g × (1 mol/18.02 g) = 12.5 mol

The total number of moles is 0.376 mol + 12.5 mol = 12.9 mol.

The mole fraction of KCl is:

X(KCl) = moles of KCl / total moles

X(KCl) = 0.376 mol / 12.9 mol

X(KCl) = 0.0291

The volume of the solution is 239 mL (0.239 L).

The molarity of KCl is:

M = moles of KCl / liters of solution

M = 0.376 mol / 0.239 L

M = 1.57 M

The molality of KCl is:

m = moles of KCl / kilograms of solvent

m = 0.376 mol / 0.225 kg

m = 1.67 m

4 0

4 years ago