The burning of fossil fuels results in which type of chemical reaction

Trava [24]

Answer:

$\boxed {\boxed {\sf 0.797 \ g \ NaOH}}$

Explanation:

<u>1. Convert Molecules to Moles</u>

First, we must convert molecules to moles using Avogadro's Number: 6.022*10²³. This tells us the number of particles in 1 mole of a substance. In this case, the particles are molecules of sodium hydroxide.

$\frac {6.022*10^{23} \ molecules \ NaOH} {1 \ mol \ NaOH}}$

Multiply by the given number of molecules.

$1.20*10^{22} \ molecules \ NaOH *\frac {6.022*10^{23} \ molecules \ NaOH} {1 \ mol \ NaOH}}$

Flip the fraction so the molecules cancel out.

$1.20*10^{22} \ molecules \ NaOH *\frac {1 \ mol \ NaOH} {6.022*10^{23} \ molecules \ NaOH}}$

$1.20*10^{22} *\frac {1 \ mol \ NaOH} {6.022*10^{23}}}$

$\frac {1.20*10^{22} \ mol \ NaOH} {6.022*10^{23}}}$

$0.0199269345732 \ mol \ NaOH$

<u>2. Convert Moles to Grams</u>

Next, we convert moles to grams using the molar mass.

We must calculate the molar mass using the values on the Periodic Table. Look up each individual element.

Na: 22.9897693 g/mol
O: 15.999 g/mol
H: 1.008 g/mol

Since the formula has no subscripts, we can simply add the molar masses.

NaOH: 22.9897693+15.999+1.008=39.9967693 g/mol

Use this as a ratio.

$\frac {39.9967693 \ g \ NaOH }{1 \ mol \ NaOH}$

Multiply by the number of moles we calculated.

$0.0199269345732 \ mol \ NaOH*\frac {39.9967693 \ g \ NaOH }{1 \ mol \ NaOH}$

The moles of sodium hydroxide cancel.

$0.0199269345732 *\frac {39.9967693 \ g \ NaOH }{1}$

$0.0199269345732 *39.9967693 \ g \ NaOH$

$0.79701300498 \ g \ NaOH$

The original measurement of molecules has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place. The 0 tells us to leave the 7 in the hundredth place.

$0.797 \ g \ NaOH$

1.20*10²² molecules of sodium hydroxide is approximately 0.797 grams.

4 0

2 years ago

Complete combustion of 8.60 g of a hydrocarbon produced 26.5 g of CO2 and 12.2 g of H2O. What is the empirical formula for the h

amid [387]

The empirical formula of the hydrocarbon is $C_2H_3$ if combustion of 8.60 g of a hydrocarbon produced 26.5 g of $CO_2$ and 12.2 g of $H_2O$ .

<h3>What is an empirical formula?</h3>

A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule $CH_2O$ is the empirical formula for glucose.

1 mole of carbon dioxide contains a mass of 44 g, out of which 12 g are carbon.

Hence, in this case the mass of carbon in 8.46 g of $CO_2$ :

( $\frac{12}{44}$ ) × 8.46 = 2.3073 g

1 mole of water contains 18 g, out of which 2 g is hydrogen;

Therefore, 2.6 g of water contains;

( $\frac{2}{18}$ × 2.6 = 0.2889 g of hydrogen.

Therefore, with the amount of carbon and hydrogen from the hydrocarbon, we can calculate the empirical formula.

We first calculate the number of moles of each,

Carbon = $\frac{2.3073}{12}$ = 0.1923 moles

Hydrogen = $\frac{0.2889}{1}$ = 0.2889 moles

Then, we calculate the ratio of Carbon to hydrogen by dividing by the smallest number value;

Carbon : Hydrogen

$\frac{0.1923}{0.1923}$ : $\frac{0.2889}{0.1923}$

1 : 1.5

(1 : 1.5) 2

= 2 : 3

Hence, the empirical formula of the hydrocarbon is $C_2H_3$ .

Learn more about the empirical formula here:

brainly.com/question/14044066

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8 0

2 years ago

Astatine is a halogen with several isotopes that all have short half-lives. Which of the following combinations of mass number a

DedPeter [7]

Answer:

Astatine is a halogen with several isotopes that all have short half-lives.

Which of the following combinations of mass number and neutrons are possible as isotopes of astatine? Choose one or more:

i) A = 211, n = 127

ii) A = 210, n = 125

iii) A = 220, n = 134

iv) A = 207, n = 122

v) A = 209, n = 124

Explanation:

The mass number is the sum of the number of protons and the number of neutrons in an atom. $A=no.of protons+no.of neutrons\\=>no.of neutrons=A-no.of protons\\$

Atomic number of At(astatine ) =85

That means it has --- 85protons.

Its mass number A=210

Hence, the number of neutrons in At are:

$n=A-Z\\=>n=210-85\\=>n=125$

Second option:

ii) A=210 , n=125 is the answer.

4 0

2 years ago

Spell out the full name of the compound Cl2O7

True [87]

The chemical compound is called d<span>ichlorine heptoxide. It's a mixture of 2 atoms of chlorine, and 7 atoms of oxygen.</span>

4 0

3 years ago

How many atm are in 1520mmHg

stealth61 [152]

Answer:

2

Explanation:

millimetre of mercury =1520

divide the pressure by 760 (do this always)

1520/760 = 2

Thats how you do it!

8 0

2 years ago