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Alika [10]
2 years ago
14

21)

Chemistry
1 answer:
RSB [31]2 years ago
8 0
It would be letter a
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How many carbon atoms are there in a 1.5-carat diamond? diamonds are a form of pure carbon. ( 1 carat=0.20 grams)?
11111nata11111 [884]
1 carot = 0.2 grams
1.5 carot = 0.3 grams.

1 mol of Carbon = 12 grams
x mol = 0.3 grams

0.3 * 1 = 12 x
x = 0.3/12
x = 0.025 mol

1 mol of Carbon is 6.02 * 10^23 atoms
0.025 mol of carbon is x

1/0.025 = 6.02*10^23 * /x
x = 0.025 * 6.02 * 10^23
x = 1.5 * 10^22 atoms of carbon.
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He decayed organic material that gives soil its dark brown or black color is called
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B) Humus is the decayed organic material that gives soil its dark brown or black color. 
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What part of the electromagnetic spectrum was first developed during ww2
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Radio waves were first developed in WWII

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A reef that surrounds a volcanic island is an
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6 0
3 years ago
What is the molar mass of (NH4)2S
Anastaziya [24]

Answer:

This compound is Ammonium Sulphide and has molar mass 68 g/mol.

Explanation:

  • Molar Mass : It is the mass of 1 mole of the substance and in grams.Its units are gram/mole.
  • It is numerically equal to mass of the substance in atomic mass units

How to calculate Molar mass :

(NH_{4})_{2}S = 2(atomic\ mass\ of\ N + 4\times mass\ of\ H ) +atomic\  mass\ of\ S

(NH_{4})_{2}S = 2(14 + 4(1) ) + 32

(NH_{4})_{2}S = 2(14 + 4 ) + 32

(NH_{4})_{2}S = 2(18) + 32

(NH_{4})_{2}S = 36 + 32

(NH_{4})_{2}S = 68 grams/mole

Molar mass of Ammonium sulphide is 68 g/mol

8 0
3 years ago
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