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3 years ago

How many molecules does water have

1 answer:

8 0

So, we calculate how many molecules there are in a drop of water, which we determined contains 0.002775 moles: molecules in a drop of water = (6.022 x 1023 molecules/mole) x 0.002275 moles. molecules in a drop of water = 1.67 x 1021 water molecules.

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Explain the difference between elements and compounds, a teacher filled

stiv31 [10]

Answer:

Kindly check explanation.

Explanation:

So, without mincing words the solution to this particular Question is given below:

First, an ELEMENT is a that entity that has what is known as the atoms. Although, there might be more elements but the recognized elements are group into the periodic table/chart. Examples of elements are Hydrogen, Helium, Lithium, Beryllium, Boron, carbon, Nitrogen, oxygen, Fluorine, neon, sodium, magnesium, Aluminium and so on.

A COMPOUND consist of different elements that are chemically combined. Examples of compounds are; H2O, CaCO3, H2SO4, HNO3, MgCl2, NaCl, HCl and many more.

Also, elements has the same atoms while componds have different number of atoms since it is a combination of elements.

Finally, ELEMENTS can not be broken down through the use of chemical process while COMPONDS can be broken down through chemical processes.

To the second part of the question. The box that will represent elements will contain balls of the same colors and the balls are not joined together.

6 0

3 years ago

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-millilite

viktelen [127]

Molar mass KCl = <span>74.5513 g/mol

Number of moles:

21.9 / 74.5513 => 0.293 moles

Volume = 869 mL / 1000 => 0.869 L

Molarity = moles / Volume

Molarity = 0.293 / 0.869

=> 0.337 M</span>

8 0

3 years ago

Find the weighted average of these values. Col1 Value 5.00 6.00 7.00Col2 Weight 75.0 % 15.0 % 10.0 %

Nadya [2.5K]

Answer:

5.35

Explanation:

Value 5.00 6.00 7.00

Weight 75.0% 15.0% 10.0 %

We can determine the weighted average of these values using the following expression.

Weighted average = ∑ wi × xi

where,

w: relative weight

x: value

Weighted average = 5.00 × 0.750 + 6.00 × 0.150 + 7.00 × 0.100

Weighted average = 5.35

7 0

3 years ago

Give the iupac name for the following compounds.

aalyn [17]

Name Methane CH4,Butane C4H10,Acetone CH3COCH3 ,Toluene Acetylene CH3C6H5, Ethyl C2H2 ,Alcohol C2H5OH

<h3>The following compound is CH3 CH3 CH2 CH2 CH2 CH3, but what is its IUPAC name?</h3>

Answer and justification A longest carbon chain in the above diagram has seven carbon atoms, as can be observed.The IUPAC nomenclature for this compound is heptane since all of the bonds are single bonds devoid of any functional groups.

<h3>What is this compound's IUPAC name, CH3 CH2 CH2 CH2 CH2 CH?</h3>

When there are nine carbons, the word non is the root.Therefore, nonane is the IUPAC term for CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH3.

To know more about iupac visit:

brainly.com/question/16631447

#SPJ4

4 0

2 years ago

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorim

Serggg [28]

Answer:

$\Delta E_{rxn}$ for combustion of naphthalene is -5164 kJ/mol

Explanation:

$\Delta E_{rxn}=C_{calorimeter}\times \Delta T_{calorimeter}$

where, C refers heat capacity and $\Delta T$ refers change in temperature.

Here, $\Delta T_{calorimeter}=(32.33-24.25)^{0}\textrm{C}=8.08^{0}\textrm{C}$

So, $\Delta E_{rxn}=(5.11\frac{kJ}{^{0}\textrm{C}})\times (8.08^{0}\textrm{C})=41.3kJ$

$\Delta E_{rxn}$ is generally expressed in terms of per mole unit of reactant. Also, $\Delta E_{rxn}$ should be negative as it is an exothermic reaction (temperature increases).

Molar mass of naphthalene is 128.17 g/mol

So, 1.025 g of naphthalene = $\frac{1.025}{128.17}moles$ of naphthalene

= 0.007997 moles of naphthalene

$\Delta E_{rxn}=-\frac{41.3kJ}{0.007997mol}=-5164kJ/mol$

5 0

3 years ago