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3 years ago

5

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1 answer:

cluponka [151]3 years ago

7 0

The equation as written is already balanced.

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Which of the following pieces of glassware can be used to measure the volume of a liquid with the

andrew11 [14]

Answer:

The correct option is GRADUATED CYLINDER.

Explanation:

Each of the glassware used in the laboratory has its specific functions. The graduated cylinder is especially manufacture to facilitate the measurement of accurate volume of liquids in the laboratory. Measurements obtained by means of graduated cylinder can be considered to be moderately accurate; volumentric flasks are more accurate than graduated cylinder and should be used when higher precision are required.

3 0

3 years ago

A 7.028 gram sample of a sodium sulfate hydrate is heated. After driving off all the water, 3.100 grams of the anhydrous salt is

Nady [450]

Answer:

$NaSO_4.10H_2O$

Explanation:

Given that:-

Mass of the hydrated salt = 7.028 g

Mass of the anhydrous salt = 3.100 g

Mass of water eliminated = Mass of the hydrated salt - Mass of the anhydrous salt = 7.028 - 3.100 g = 3.928 g

<u>Moles of water: </u>

Mass of water = 3.928 g

Molar mass of $H_2O$ = 18 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus, moles are:

$moles= \frac{3.928\ g}{18\ g/mol}$

$moles_{water}= 0.2212\ mol$

<u>Moles of anhydrous salt: </u>

Amount = 3.100 g

Molar mass of $NaSO_4$ = 142.04 g/mol

Thus, moles are:

$moles= \frac{3.100\ g}{142.04\ g/mol}$

$moles_{CaSO_4}= 0.02182\ mol$

The simplest ratio of the two are:

$NaSO_4:H_2O$ =0.02182 : 0.2212 = 1 : 10

<u>Hence, the formula for hydrate is:- $NaSO_4.10H_2O$ </u>

7 0

3 years ago

Can someone balance these equations?

wolverine [178]

This is mind numbing, but I got you.

3NaOH + 1FeCl<em>3</em> = 1Fe(OH)<em>3 </em>+ 3NaCl

3Mg + 2H<em>3</em>(PO)<em>4</em> = 1Mg(PO<em>4</em>)<em>2</em> + 3H<em>2</em>

3 0

3 years ago

A compound that is composed of only carbon and hydrogen contains 80.0% c and 20.0% h by mass. What is the empirical formula of t

gladu [14]

<u>Solution</u> : Emperical Formula = $CH_{3}$

Emperical Formula - A formula that gives the simplest whole number ratio of atom in a compound.

In the question percentages are given then assume that the total mass is 100grams so that the mass of each element is equal to the percentage given.

Given : 80.0g Carbon

20.0g Hydrogen

First convert the given masses into moles.

$80.0g\text{ C} \times \frac{1 g/mole \text{ C}}{12.0 g/mole \text{ C}}= 6.66\text{mole of C}$

$20.0g\text{ H} \times \frac{1 g/mole \text{ H}}{1 g/mole \text{ H}}= 20.0\text{mole of H}$

Value of each mole divided by the smallest number of moles and then round off.

Moles ratio of the element are

$\frac{6.66}{6.66}\text{mole of C}= 1$

$\frac{20.0}{6.66}\text{mole of C}= 3$

This is the mole ratio of the elements and is repersented by the subscript in the emperical formula.

Emperical Formula = $CH_{3}$

3 0

4 years ago

Why did the french became allies with the american?

Rus_ich [418]

Answer:

It’s to gain territory

Because they wanted more territory than what they already had.

8 0

3 years ago