# need help answering questions

Empirical

1.

What is the empirical formula of a compound composed of 25.1 g

$\text{}$

of potassium (K

$\text{}$

) and 5.14 g

$\text{}$

of oxygen (O

$\text{}$

)? Insert subscripts as needed.

empirical formula:

KO



2.

A 17.02



g sample of a compound contains 5.43



g of potassium, K,

$\text{}$

4.92



g of chlorine, Cl,

$\text{}$

and oxygen, O.

$\text{}$

Calculate the empirical formula.

Insert subscripts as needed.

Empirical formula:

KClO



3.

A 9.32



g sample of a compound contains 5.95



g of iron, Fe,

$\text{}$

1.10



g of phosphorus, P,

$\text{}$

and oxygen, O.

$\text{}$

Calculate the empirical formula for the compound.

empirical formula:

4.

Determine the empirical formula for a compound that contains 58.8%



C, 9.8%



H, and 31.4%



S by mass.

empirical formula:



5.

Determine the empirical formula for a compound that is 62.1%



C, 10.4%



H, and 27.5%



O by mass.

empirical formula:



6.

What is the empirical formula of a compound composed of 3.25% hydrogen (H

$\text{}$

), 19.36% carbon (C

$\text{}$

), and 77.39% oxygen (O

$\text{}$

)by mass?

Insert subscripts as needed.

empirical formula:

HCO



hw 8

For the chemical reaction shown,

2H2O2(l)+N2H4(l)4H2O(g)+N2(g)

$\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

determine how many grams of N2 are produced from the reaction of 9.97



g of H2O2 and 6.35



g of N2H4.

g

When heated, KClO3

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

decomposes into KCl

$\text{}$

and O2.

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

2KClO32KCl+3O2

$\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\phantom{\rule{0ex}{0ex}}\text{}\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

If this reaction produced 89.1 g KCl,

$\text{}\text{}\text{}$

how many grams of O2

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

were produced?

g O2

$\text{}{\text{}}_{}^{}$

1.

When 0.540



g of sodium metal is added to an excess of hydrochloric acid, 5610



J of heat are produced. What is the enthalpy of the reaction as written?

2Na(s)+2HCl(aq)2NaCl(aq)+H2(g)

$\phantom{\rule{0ex}{0ex}}\text{}\text{}\phantom{\rule{0ex}{0ex}}\text{}\text{}\phantom{\rule{0ex}{0ex}}\text{}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

When methanol, CH3OH,

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\text{}$

is burned in the presence of oxygen gas, O2,

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

a large amount of heat energy is released, as shown in the combustion reaction.

CH3OH(g)+32O2(g)CO2(g)+2H2O(l)Δ =764 kJ

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\text{}\frac{}{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\text{}\phantom{\rule{0ex}{0ex}}\text{}$

Based on the balanced thermochemical reaction, how much heat is produced when 33.6 g

$\text{}$

of methanol reacts with 52.1 g

$\text{}$

of oxygen?

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.

CaCO3(s)+2HCl(aq)CaCl2(aq)+H2O(l)+CO2(g)

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\phantom{\rule{0ex}{0ex}}\text{}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

How many grams of calcium chloride will be produced when 30.0 g

$\text{}$

of calcium carbonate is combined with 12.0 g

$\text{}$

of hydrochloric acid?

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

:

g

$\text{}$

Which reactant is in excess?

$\text{}$

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

How many grams of the excess reactant will remain after the reaction is complete?

Nitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia.

N2(g)+3H2(g)2NH3(g)

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}\phantom{\rule{0ex}{0ex}}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

Assume 0.200 mol N2

$\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

and 0.633 mol H2

$\text{}{\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

are present initially.

After complete reaction, how many moles of ammonia are produced?

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

:

mol

$\text{}$

How many moles of H2

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

remain?

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

mol

$\text{}$

How many moles of N2

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}$

remain?

${\text{}}_{}^{\phantom{\rule{0ex}{0ex}}}\text{}$

mol

$\text{}$

What is the limiting reactant?

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.