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konstantin123 [22]
3 years ago
9

Draw this image below. It shows one ton of feathers and one ton of bricks a. Compare the mass of the two substances:

Chemistry
1 answer:
bogdanovich [222]3 years ago
8 0

I don't understand the question

Can you elaborate further

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How many moles are in 5.0 x 10 *23 atoms of iron?
tamaranim1 [39]
1 mole ------------ 6.02 x 10²³ atoms
? moles ----------- 5.0 x 10²³ atoms

moles = 5.0 x 10²³ / 6.02 x 10²³

= 0.830 moles

hope this helps!
7 0
3 years ago
A sample of gold (Au) has a mass of 45.39 g.
professor190 [17]
<span>1. What is the molar mass of gold?
Molar mass is a unit that expresses the mass of a molecule per one mol. The molar mass can be obtained by adding the neutron with the proton of the atoms. Gold has atomic number 79 so the proton is 79. The number of the neutron is 118. Then the molar mass would be: 79 + 118 = </span>197 g/mol<span>


</span><span>2. Calculate the number of moles of gold (Au) in the sample. Show your work. 
</span>In this question, you are given the mass of the gold and asked for how many moles the sample has. To find the number of moles you just need to divide the weight by the molar mass.
For 45.39 grams of gold, the number of moles would be:
45.39 / (197g/mol)= 0.23 moles


3. Calculate the number of atoms of gold (Au) in the sample. Show your work.Moles is unit of a number of molecules but 1 mol doesn't represent 1 molecule. The number of atoms can be obtained by multiplying the number of moles with Avogadro number. The calculation would be:
0.23 moles * (6.023 * 10^23 molecules/mol)= 1.387 * 10^23 molecules
8 0
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What other missions had been to Mars, and what did they accomplish?
lesya692 [45]

Answer:

they stayed alive?

Explanation:

easy

5 0
2 years ago
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State four uses of protein in human body??​
Mamont248 [21]

Your body uses it to build and repair tissue. You need it to make enzymes, hormones, and other body chemicals. It is an important building block of bones, muscles, cartilage, skin, and blood. Along with fat and carbohydrates.

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In the equation Na + Cl2 → 2NaCl . What is the product?
laila [671]
The product would be 2NaCI. Hope this helps xx
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