How many molecules are in 69 grams of Na?

Answers

Answer 1

Answer: Molar mass Na = 23.0 g/mol

1 mol ---- 23.0 g
n mol ---- 69 g

n = 69 / 23.0

n = 3.0 moles

1 mole -------- 6.02x10²³ molecules
3.0 moles ---- ?

3.0 * 6.02x10²³ / 1

= 1.806x10²⁴ molecules

hope this helps!

Related Questions

Which lists the elements in order from least conductive to most conductive?A. nitrogen (N), antimony (Sb), bismuth (Bi)B. nitrogen (N), bismuth (Bi), antimony (Sb)C. antimony (Sb), nitrogen (N), bismuth (Bi)D. bismuth (Bi), antimony (Sb), nitrogen (N)
A gas changes directly to a solid during(1) fusion (3) saponification(2) deposition (4) decomposition
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The elements in each column have ___________

What are some non examples of systems.

Answers

Solar systems nuclear systems there are all types of systems which one do you prefer

A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ reaction. A. double replacement
B. substitution
C. decomposition
D. combination

Answers

A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a combination reaction.

What is a chemical reaction?

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

Learn more about chemical reactions,here:

brainly.com/question/29762834

#SPJ6

Answer : The correct option is, (D) Combination

Explanation :

Double replacement reaction : A chemical reaction in which a positive cation and a negative anion of the two reactants exchange places to give two new products or compounds.

The general representation of this reaction is,

$AB+CD\rightarrow AD+CB$

(A and C are the cations, B and D are the anions)

Substitution reaction : A chemical reaction in which a more reactive element displaces the least reactive element.

The general representation of this reaction is,

$A+BC\rightarrow A+CB$

Decomposition reaction : A chemical reaction in which a bigger compound breaks into two or more smaller compounds or elements.

The general representation of this reaction is,

$AB\rightarrow A+B$

Combination reaction : A chemical reaction in which two or more substances react to form a more complex substance.

The general representation of this reaction is,

$A+B\rightarrow AB$

Hence, the correct option is, (D) Combination

An inherited behavior or physical characteristics that helps an organism survive and reproduce Natural selection Predation Adaptation Competitionlook at pic thanks :D

Answers

Answer:

it's natural selection

Explanation:

adaptation is when you adapt to some situation

Ammonia is produced by the following reaction. 3H2(g) + N2(g) ---> 2NH3(g) When 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because

Answers

To determine the limiting reactant, we first calculate the number of moles of the reactant.

7.00 g H2 ( 1 mol / 2.02 g ) = 3.47 mol H2
70.00 g N2 ( 1 mol / 28.02 g) = 2.50 mol N2

From the balanced reaction, we see that there is a 3 is to 1 ratio of the reactants. So, for every 3 moles of H2 we need 1 mole of N2. Given the amount of reactant, for 2.50 moles of N2 we need 7.5 moles of H2 which obviously we have a lesser amount. Hydrogen is the limiting reactant.

The correct answer is A

At higher elevations, the boiling point of water decreases, due to the decrease in atmospheric pressure. As a result, what conclusion could be drawn from the boiling egg?a.At higher elevations, it would take less time to hard boil an egg, because there is less atmospheric pressure.
b.
At higher elevations, it would take longer to hard boil an egg, because there is a lower boiling point, so the egg is boiling in water at a lower temperature.
c.
At higher elevations, it would take less time to hard boil an egg, because there is a lower boiling point. Therefore it would take less time to achieve the boiling point.
d.
At higher elevations, it would take longer to hard boil an egg, because it would take longer to achieve the boiling point.

Answers

I believe the correct response is A. At higher elevations it would take less time to hard boil an egg, because there is less atmospheric pressure.

Which compound is an electrolyte?
(1) C6H12O6 (3) CaCl2
(2) CH3OH (4) CCl4

Answers

I think the correct answer is option 3. CaCl2 is the compound that is an electrolyte when dissolved in water. An electrolyte is a substance that conducts electricity in solution. Calcium Chloride when in solution dissociates into ions which allows the flow of current in the solution.

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