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3 years ago

. How many grams of Na2SO4 are required to make 2700 mL of a 2.0 M solution?

Chemistry

2 answers:

ratelena [41]3 years ago

6 0

Answer:

Explanation:

From the net ionic equation

Ba2+(aq) + SO42-(aq) ==> BaSO4(s) we see that 1 mole Ba2+ reacts with 1 mole SO42- to -> 1 mol BaSO4

Find moles of Ba2+ used: 0.250 moles/L x 0.0323 L = 0.008075 moles Ba2+

Find moles SO42- present: 0.008075 moles Ba2+ x 1 mol SO42-/1 mol Ba2+ = 0.008075 mol SO42-

Find mass of Na2SO4 present: 0.008075 mol SO42- x 1 mol Na2SO4/1 mol SO42- x 142.04 Na2SO4/mole = 1.14698 g = 1.15 g Na2SO4 (to 3 significant figures)

Andru [333]3 years ago

6 0

Answer: Approx 2kg of salt are required.

Explanation: If 4.5 ⋅ L of a 3.0 ⋅ m o l ⋅ L − 1 solution are required, this is a molar quantity of 4.5 ⋅ L × 3.0 ⋅ m o l ⋅ L − 1 = 13.5 ⋅ m o l . Now, we simply multiply this molar quantity by a molar mass to get the mass: 13.5 ⋅ m o l × 142.04 ⋅ g ⋅ m o l − 1 = ? ? ⋅ g

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tensa zangetsu [6.8K]

Answer: Set with equal densities are:

15.2 g copper and 50.0 g copper ; 11.2 g gold and 14.9 g gold

Explanation:

Density is defined as mass of the substance present in unit volume of the substance.

$Density=\frac{Mass}{Volume}$

It is an intensive property which means that two different masses of same substance will have same value of density under same conditions.

So, from the given samples with equal density are:

15.2 g copper and 50.0 g copper will have the same value density.

11.2 g gold and 14.9 g gold will have the same value density.

6 0

3 years ago

Read 2 more answers

Match the following pls

Elenna [48]

Answer:

1 d

2 c

3 b

4 e

5 a

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3 years ago

Driving water out of crystals. Which piece of equipment are you likely to use. Crucible Erlenmeyer flask evaporating dish

lora16 [44]

Driving water out of crystals are crystallization process.

The piece of equipment used are evaporating dish.

Explanation:

Crystallization process

Crystallization is a process of converting crystalline solid state into liquid state.
It works both in purification and separation step.
Steps involved in the crystallization process are

a) Nucleation

b) Crystal growth

It is the oldest unit operation methods.
Methods involved in this process are solvent evaporation, slow cooling, solvent diffusion and sublimation.

Evaporating dish

Evaporating dish is a shallow open container.
Evaporating dish is used to heat and evaporate solids.
It is made by borosilicate glass or porcelain, which is non-reactive and withstand heat from Bunsen burner.

8 0

3 years ago

The following reaction is at equilibrium: 2C + 3H 2 ⇌ C 2H 6 + heat If C 2H 6 is added to the system, which of the following wil

Sever21 [200]

Pretty sure it’s C the added products drives reverse reaction and since forward releases heat, reverse would absorb.

4 0

4 years ago

What are the differences between a Lewis Structure and a Bohr diagram?

Xelga [282]

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Bohr's model is one of the ea.rliest model of atom in history, modified from Ruth.erford's model.

In 1913, a D.anish physi.cts, Niels Bohr refi.ned Ruth.erford model of the atom. How.ever, he disco.vers that elec.tron can only have spe.cific amo.unts of energy. These energy levels are also known as ele.ctron shells.

As for the Lewis Dot Structure, it is the m.odel of an atom that has the che.mical symbol for the ele.ment surronded by dots to rep.resent the valence ele.ctron of the ele.ment.

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7 0

3 years ago