What mass of sodium carbonate is required to prepare 2.00 l of 0.250 M Ma2CO3 solution

Answers

Answer 1

Answer: Molar mass Na₂CO₃ = 106.0 g/mol

M(Na₂CO₃) = molarity x volume x molar mass

M(Na₂CO₃) = 0.250 x 2.00 x 106.0

M (Na₂CO₃) = 53 g

hope this helps!

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Complete the balanced equation: Cu(NO3)2 + Na2CO3 > ?
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What is the structure of beeswax that contains 16 carbon of carboxylic acid and 30 carbon of alcohol?

Answers

Answer:

Tricontanyl palmitate: CH₃-(CH₂)₂₉-O-CO-(CH₂)₁₄-CH₃

Explanation:

Beeswax is a tough natural wax which is produced by the worker honey bees. The beeswax is an ester of the long chain fatty acids and alcohols. One of the major components of beeswax is tricontanyl palmitate.

Tricontanyl palmitate is a wax ester that is composed of 16-carbon fatty acid and a 30-carbon alcohol, joined by an ester linkage.

The molecular structure of tricontanyl palmitate is:

CH₃-(CH₂)₂₉-O-CO-(CH₂)₁₄-CH₃

This is the answer hope this helps

Describe cycling or movement of water throughout earths spheres. Explain why the process is considered a cycle. Write a complete paragraph (five complete sentences minimum) in order to receive full credit for this activity

Answers

Answer:

This process is considered as a cycle because it continues and dosent stops. This process includes the evaporation of watet from earth surface due to heat.this water is converted in to water vapours. After reaching clouds it condences back. When the clouds become heavy with watef it falls back on earth as rain.and the process repeats.

Explanation:

Consider the following 1.0 mol L–1solutions. Which one of the following lists the
solutions in decreasing order (that is, strongest to weakest) of electrolyte strength?

(a) sodium phosphate > sulfuric acid > phosphoric acid > sucrose (sugar)
(b) sucrose (sugar) > sulfuric acid > phosphoric acid > sodium phosphate
(c) sulfuric acid > sodium phosphate > phosphoric acid > sucrose (sugar)
(d) sodium phosphate > phosphoric acid > sulfuric acid > sucrose (sugar)

Answers

(a) sodium phosphate > sulfuric acid > phosphoric acid > sucrose (sugar)
(b) sucrose (sugar) > sulfuric acid > phosphoric acid > sodium phosphate
(c) sulfuric acid > sodium phosphate > phosphoric acid > sucrose (sugar)
(d) sodium phosphate > phosphoric acid > sulfuric acid > sucrose (sugar)

Copper metal (Cu) reacts with silver nitrate (AgNO3) in aqueous solution to form Ag and Cu(NO3)2. An excess of AgNO3 is present. The balanced chemical equation is shown below.Cu + 2AgNO3 ---> Cu(NO3)2 + 2Ag

The molar mass of Cu is 63.5 g/mol. The molar mass of Ag is 107.9 g/mol. What mass, in grams, of Ag is produced from reaction of 31.75 g of Cu?

26.95
107.9
215.91
431.82

Answers

we are given the reaction Cu + 2AgNO3 ---> Cu(NO3)2 + 2Ag. This means for every mole Cu used, there are 2 moles of Ag produced. In this case, given 31.75 g Cu, converting to moles through molar mass and using stoichiometric ratio and the molar mass of Ag, the mass Ag produced is 107.9 grams.

The mass in grams of Ag produced from reaction of 31.75g of Cu is 107.9 grams

calculation

Cu+2AgNO3 ---> Cu(NO3)2 + 2Ag

find the moles of Cu that reacted

moles= mass/molar mass

=31.75 g/63.5 g/mol= 0.5 moles

from the equation above the mole ratio of CU:Ag is 1:2 therefore the moles of Ag=0.5 moles x2 = 1 mole

mass of Ag= moles of Ag x molar mass

= 1 mole x107.9g/mol = 107.9 grams

Does a solution have to involve a liquid? explain.

Answers

No, not always. There is always going to be solutions of gases in the air. And, there may be a solution of metals in alloys.

Basically, a solution is just any of the same mixture, which is solid-solid, liquid-liquid, and gas-gas.

Yes a solution does have to involve liquid. For example. when when dissolving a solid you must have liquid to do so. And it also must contain liquid for another liquid. The Fact f one substance dissolving into another substance will require liquid.

Which of the following is NOT a clue that a chemical change has occurred?a. change in color
b. production of a gas
c. formation of a precipitate
d. change in shape

Answers

change in shape is the answer because all chemical reactions only affect the chemical composition of the substance

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