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ratelena [41]
4 years ago
8

How many moles are in a sample of Sodium that contains 1.806 x 1024 atoms?

Chemistry
1 answer:
Ad libitum [116K]4 years ago
3 0

Answer: 3 moles Na

Explanation: To find the number of moles of Na, divide the number of atoms of Na with the Avogadro's Number.

1.806x10²⁴ atoms Na x 1 mole Na / 6.022x10²³ atoms Na

= 2.99 or 3 moles Na

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How many moles are present in 63.80L of oxygen gas, O2?
matrenka [14]

Answer:

2.85moles of oxygen gas

Explanation:

Given parameters:

Volume of oxygen gas  = 63.8L

Unknown:

Number of moles  = ?

Solution:

We assume that the gas is under standard temperature and pressure. To find the number of moles, use the expression below:

     1 mole of a gas at STP occupies a volume of 22.4L

 So;

       63.8L of oxygen gas will take up a volume of

              \frac{63.8}{22.4}   = 2.85moles of oxygen gas

4 0
3 years ago
What are 3 ways living creatures use carbohydrates
Zarrin [17]
Food, Storage, and Structure
4 0
3 years ago
How do i make homemade cookies without a mix
OLga [1]
<h2>ingredients:</h2>

2 ¾ cups all-purpose flour

1 teaspoon baking soda

½ teaspoon baking powder

1 cup butter, softened

1 ½ cups white sugar  

1 egg

1 teaspoon vanilla extract

Explanation:

Step 1

Preheat oven to 375 degrees F (190 degrees C). In a small bowl, stir together flour, baking soda, and baking powder. Set aside.

Step 2

In a large bowl, cream together the butter and sugar until smooth. Beat in egg and vanilla. Gradually blend in the dry ingredients. Roll rounded teaspoonfuls of dough into balls, and place onto ungreased cookie sheets.

Step 3

Bake 8 to 10 minutes in the preheated oven, or until golden. Let stand on cookie sheet two minutes before removing to cool on wire racks.

Partner Tip

Reynolds® Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.

creds to : https://www.allrecipes.com/recipe/9870/easy-sugar-cookies/

hope you have a wonderful day :)

4 0
4 years ago
A 0.10 M aqueous solution of sodium sulfate, Na2SO4, is a better conductor of electricity than a 0.10 M aqueous solution of sodi
Dvinal [7]

Answer: D) More moles of ions are present in a given volume of 0.10 M Na_2SO_4 than in the same volume of 0.10 M NaCl.

Explanation:

A electrolyte is a solution that dissociates completely when dissolved in water. The ions act as good conductors of electric current in the solution.

More is the number of ions , more will be the conductance and hence the solution will be a better conductor of electricity.

0.10 M aqueous solution of Na_2SO_4 is a better conductor of electricity as it dissociates to give three ions whereas 0.10 M aqueous solution of NaCl dissociates to give two ions only.

Na_2SO_4\rightarrow 2Na^++SO_4^{2-}

NaCl\rightarrow Na^++Cl^{-}

Thus 0.10 M aqueous solution of sodium sulfate, Na_2SO_4 , is a better conductor of electricity as more moles of ions are present in a given volume of 0.10 M Na_2SO_4 than in the same volume of 0.10 M NaCl

3 0
3 years ago
Why do not all rock types contain fossils?
nata0808 [166]

Answer:

Igneous rocks form from molten rock, and rarely have fossils in them. Metamorphic rocks have been put under great pressure, heated, squashed or stretched, and fossils do not usually survive these extreme conditions. Generally it is only sedimentary rocks that

Explanation:

Hope it helps, some how.

Your welcome :)

6 0
3 years ago
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