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BartSMP [9]
3 years ago
6

Hi kay my account got deleted this is my new one

Chemistry
2 answers:
zysi [14]3 years ago
8 0

Answer:

um hi

Explanation:

jek_recluse [69]3 years ago
3 0

Answer:

hUh

Explanation:

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Tooth enamel is ca5(po4)3(oh). calculate the percent composition of the elements present.
Mama L [17]
We shall find the molar mass first.  
Ca5(PO4)3(OH) = (40 * 5) + 3 (31 + 4(16)) + 16 + 1 = 200 + 285 + 17 = 485 + 17 = 502. 
Percent of Calcium = 200/ 502 * 100 = 39.8%
 Percent of Phosphorus = 91/502 * 100 = 18.1%
 Percent of Hydrogen = 1/502 * 100 = 0.19%
 Percent of Oxygen = 100 - (39.8 + 18.1 + 0.19) = 41.91%

8 0
3 years ago
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For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?
pochemuha

For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?

The answer is C

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3 years ago
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What are ways heat can spread
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Added on wood, gasoline, wind
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3 years ago
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Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n-, where n is typically greater than 10,00
pentagon [3]

Answer:

7.68 × 10²⁴

Explanation:

Step 1: Calculate the mass of 1 molecule of the monomer CH₂CHCN

We will get the mass of the monomer by adding the masses of the elements.

mCH₂CHCN = 3 × mC + 3 × mH + 1 × mN

mCH₂CHCN = 3 × 12.01 amu + 3 × 1.01 amu + 1 × 14.01 amu = 53.07 amu

Step 2: Convert the mass of the monomer to grams

We will use the conversion factor 1 amu = 1.66 × 10⁻²⁴ g

53.07 amu × 1.66 × 10⁻²⁴ g/1 amu = 8.81 × 10⁻²³ g

Step 3: Calculate "n"

We will divide the mass of the polymer by the mass of the monomer.

n = 676.8 g / 8.81 × 10⁻²³ g = 7.68 × 10²⁴

6 0
3 years ago
Use the drop-down menus to classify each of these substances,
raketka [301]

Answer:

  • Perfume = Ester
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  • Anesthetic = Ether
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  • Weak acid = Carboxylic acid

Explanation:

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It is active due to global impairment in cognition, behavioral, and physiological phenomena that are developed after the repeated use of the substances abuse that is related to the strong desire to use the drugs.

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3 years ago
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