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densk [106]
2 years ago
7

PLEASE ANSWER THIS FASTE LIKE RIGHT KNOW!!!!!

Chemistry
1 answer:
mamaluj [8]2 years ago
3 0
The two strands of a DNA molecule must be separated
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Why do we use commas after transition words?
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C - commas indicate a natural pause in the sentence

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The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are
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63.546

Explanation:

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sum of the product of the atomic masses and their relative abundances all divided by 100 or total abundance

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3 years ago
Acetic acid (HC2H3O2) is the active ingredient in vinegar. Calculate the mass percent composition of O in acetic acid.
skelet666 [1.2K]

Answer:

53.29% of acetic acid is Oxygen

Explanation:

Step 1: Given data

Acetic acid it's molecular formula is HC2H3O2. This means it consists of 3 elements Carbon, Hydrogen and oxygen.

Step 2: the molar masses

The molecular mass of acetic acid is:

4* H = 4* 1.01 g/mole

2* C = 2*12 g/mole

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Total molar mass = 4+ 24+32 = 60.052 g/mole

Step 3: Calculate the mass percent

32 g of the 60.052 g is Oxygen

(32/60.052) *100% = 53.29%

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3 years ago
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Thermal expansion happens when
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