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1 year ago

What is the mass of 0.20 mole of C₂H6O (ethanol)?

Chemistry

1 answer:

lesya [120]1 year ago

6 0

Answer:

9.2-g of ethanol

Explanation:

The question is asking for us to solve for the mass of ethanol given the moles of it.

We can do this by going from mol -> grams using the <u>molar mass of ethanol</u> (46.068g).

Start off with the moles given (0.20mol) and multiply it by the molar mass of ethanol (46.068g).

This would give the mass of 9.214-g, but since our question has only 2 significant figures, round off your final answer to the same number of sig. figs.

So your final answer would be 9.2-g of ethanol.

***Molar mass is calculated by adding the masses of each element (found in periodic table) by how many times they are in the molecules.

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In a single displacement reaction between Sodium Phosphate and Barium, how much of each product (in grams) will be formed from 1

mixer [17]

Answer:

14.6 g of barium phosphate

3.35 g of sodium metal

Explanation:

2Na3PO4(aq) + 3Ba(s) -------> Ba3(PO4)2(aq) + 6Na(s)

The first step in any such reaction is to but down the balanced reaction equation according to the stoichiometry of the reaction.

The two products formed are barium phosphate and sodium metal.

Number of moles of barium corresponding to 10.0g of barium = mass of barium/ molar mass of barium

Molar mass of barium = 137.327 g

Number of moles of barium = 10/137.327

Number of moles of barium = 0.0728 moles

For barium phosphate;

3 moles of barium yields 1 mole of barium phosphate

0.0728 moles yields 0.0728 moles × 1/3 = 0.0243 moles of barium phosphate

Molar mass of barium phosphate = 601.93 g/mol

Therefore mass of barium phosphate = 0.0243 moles × 601.93 g/mol = 14.6 g of barium phosphate

For sodium metal

3 moles of barium yields 6 moles of sodium metal

0.0728 moles of barium yields 0.0728 × 6 / 3 = 0.1456 moles of sodium

Molar mass of sodium metal= 23 gmol-1

Mass of sodium metal= 0.1456g × 23 gmol-1 = 3.35 g of sodium metal

4 0

3 years ago

What are the chemical formulas for..

andrezito [222]

S4O5
S3O
SeF6
N4S5
CCl9

All numbers should be subscripts

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3 years ago

How do you unlock a post test on edmentum?

postnew [5]

Explanation:

A post-test or a mastery test can be unlocked if the learner who has the of it previously can complete the given tutorial with the test.

After the tutorial with the test, the learner will have to complete everything and if he passes the test with a completed answer then he will see that the Mastery Test has been unlocked. Also after the mastery test is unlocked it can be done again.

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3 years ago

Acetylene is the substance burned in oxy-acetylene torches. Write a balanced equation for the complete oxidation reaction that o

nexus9112 [7]

Answer: $2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products must be same as the mass of reactants.

For the conservation of mass, the number of atoms of each element must be same in reactants and products. Thus we need to balance the reaction by writing appropriate stochiometric coefficients.

All the hydrocarbons burn in oxygen to form carbon dioxide and water.Thus the complete balanced equation is:

$2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

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3 years ago

A concrete floor is poured as a liquid. As it hardens, it produces quite a bit of heat. Physical change or chemical change?

Natali5045456 [20]

Answer:

Chemical change

Explanation:

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3 years ago