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3 years ago

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What is the enthalpy in KJ of reaction for the initial combustion if the delta H for vaporization is 75.75 KJ and the net delta

H is -700 kJ?
Write your answer to hundredths, including a negative sign if needed. Do not write the unit.

1 answer:

Gnesinka [82]3 years ago

4 0

Answer:

-775.75

Explanation:

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Often express in psi, pressure is the term for force per unit of

taurus [48]

Answer:

Surface area

Explanation:

psi = pound square inch

Often expres in psi, pressure s the term for force per unit of surface area.

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1 year ago

Write the salient features of long form of Periodic Table .

frez [133]

Answer:

(1) It shows arrangement of elements based on modern periodic law.

(2) There are 18 vertical columns known as groups.

(3) There are 7 horizontal rows known as periods.

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2 years ago

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Calculate the Experimental Molar Volume in L/mol of the Hydrogen gas, H2, if the volume of H2 at STP is 52.8 mL and the mass of

lana66690 [7]

Answer:

The Experimental Molar Volume in L/mol of the Hydrogen gas=23.36L/mol

Explanation:

We are given that

Volume of H2 at STP=52.8mL

Mass of magnesium metal ,M(Mg)=0.055g

We have to find the Experimental Molar Volume in L/mol of the Hydrogen gas.

Molar mass of Mg=24.305 g/mol

Number of moles= $\frac{given\;mass}{molar\;mass}$

Using the formula

Number of moles of Mg= $\frac{0.055}{24.305}$ moles

Number of moles of Mg=0.00226moles

Number of moles of Mg=Number of moles of H2

Number of moles of H2=0.00226moles

Molar volume of Hydrogen gas (H2)= $\frac{volume\;at\;STP}{No\;of\;moles\;H_2}$

Molar volume of Hydrogen gas (H2)= $\frac{52.8}{0.00226}mL/mol$

Molar volume of Hydrogen gas (H2)= $\frac{52.8}{0.00226}\times 10^{-3}L/mol$

$1L=1000mL$

Molar volume of Hydrogen gas (H2)=23.36L/mol

Hence, the Experimental Molar Volume in L/mol of the Hydrogen gas=23.36L/mol

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3 years ago

The elements present in common salt are ..

marin [14]

Answer:

Hello, There!

I'm glad to help!

The molecular formula of common salt is $NaCI$

And the elements present are

Sodium ( $Na)$

Chlorine $(CI)$

Explanation:

<u><em>A pure substance that consists of only the same kind of atoms is called an element whereas two or more elements combine to form a compound. </em></u>

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<em>Therefore, I hope this Helps!</em>

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3 years ago

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Draw the structures and provide the names of all the isomeric alcohols that have the molecular formula C4H10O Draw the structure

Step2247 [10]

Answer:

Draw the structures and provide the names of all the isomeric alcohols that have the molecular formula C4H10O.

Draw the structures of (a) 6-methyl-3-heptanol and (b) trans-2-methylcyclohexanol

Explanation:

Isomers are compounds with the same molecular formula but different structural arrangements of atoms.

The given molecule is:

C4H10O.

The possible isomeric alcohols structures are shown below:

Structure of (a) 6-methyl-3-heptanol:

The root word -hept indicates that the main carbon chain has seven carbons.

-ol suffix indicates the presence of alcohol functional group at third carbon.

The 6-methyl prefix indicates the presence of methyl group as the substituent at the sixth position of the main carbon chain.

The structure of 6-methyl-3-heptanol is shown below:

The structure of trans-2-methyl cyclohexanol is shown below:

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3 years ago