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3 years ago

BRAINLIEST FOR CORRECT ANSWER!!!!

2 answers:

6 0

The correct option is EACH ELEMENT HAS A UNIQUE ENERGY LEVELS.
The emission spectrum of an element refers to the frequencies of electromagnetic radiation which are emitted from the element as a result of the transitions of the element through various energy levels.

zaharov [31]3 years ago

5 0

The answer is D on edge

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How did Dalton describe the relationship between atoms and elements? An element is made up of one kind of atom. Atoms are made u

victus00 [196]

Answer: An element os made up of one kind of atom.

Explanation: Dalton's concept states that all atoms of an element is identical.

5 0

3 years ago

Read 2 more answers

Using Avogadro's Number (6.02*10^23): Calculate the number of molecules in 3.00 moles H2S . Express your answer numerically in m

mars1129 [50]

Avagadro's number is just a measurement. One mole is 6.022 X 10^23 of anything - atoms, molecules, marbles... anything.
1) If one mole = 6.022 X 10^23, then 8.00mol of H2S is: 
(3.00mol H2S) (6.022 X 10^23 molecules H2S / 1 mol H2S) = 1.8060 X 10^24 molecules H2S. 
Rounded to 3 sig figs =1.81 X 10^24 molecules H2S
part2.
 This one uses moles in the stoichiometric sense as well as the measurement. One formula unit of MgCl2 contains 1 mole Mg and 2 moles Cl. 
First, figure out how many moles of formula units there are. 
(1.81 X 10^24 FU's) (1mol MgCl2 / 6.022 X 10^23 FU's) = 3.0056mol MgCl2.

Now, we know that there are 2 moles of Cl in every mole of MgCl2 (2 Cl atoms in every unit of MgCl2). From this we can determine how many moles of Cl atoms there are: 
(3.0056mol MgCl2) (2mol Cl atoms / 1mol MgCl2) = 6.0112mol Cl atoms. 
Now round to 3 sig figs = 10.0mol Cl atoms

3 0

3 years ago

Read 2 more answers

Use the reaction to answer the question.

ki77a [65]

Answer:

The product expected is 10CO2 + 4H2O

7 0

3 years ago

An 8.89 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 27.1 mL of 0.581 M potassium h

worty [1.4K]

Answer:

The percent by mass of nitric acid in the mixture is 11.1 %

Explanation:

Step 1: Data given

Mass of HNO3 = 8.89 grams

Volume of KOH = 27.1 mL = 0. 0271 L

Molarity of KOH = 0.581 M

Step 2: The balanced equation

HNO 3 + KOH → KNO 3 + H 2 O

Step 3: Calculate the moles of KOH

Moles of KOH = molarity KOH * volume

Moles KOH = 0.581 M * 0.0271 L

Moles KOH = 0.0157 moles

Step 4: Calculate moles of HNO3

For 1 mol of KOH we need 1 mol of HNO3

For 0.0157 moles of KOH we need 0.0157 moles of HNO3

Step 5: Calculate mass of HNO3

Mass KOH = moles KOH * molar mass KOH

Mass KOH = 0.0157 moles * 63.01 g/mol

Mass KOH = 0.989 grams

Step 6: Calculate mass % HNO3 in sample

mass % = (0.989 grams / 8.89 grams)*100%

mass % = 11.1 %

The percent by mass of nitric acid in the mixture is 11.1 %

3 0

4 years ago

How many molecules are in 3.94g of SO2?

IRISSAK [1]

To find the number of molecules, you need to first convert the mass into number of mol using the molar mass of SO2, simply add the atomic masses of each element and the number of times each element appears in the formula from the periodic table.

Then divide the mass by that value and then use Avogadro’s number to find the molecules.

Multiply by 6.02 x 10^23 Molecules.

5 0

4 years ago