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3 years ago

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How are the codes (chemical formulas) for elements different from those for compounds?

1 answer:

DanielleElmas [232]3 years ago

3 0

a) Two or more atoms held together with bonds make up a molecule. b) Pure substances are made of only one type of atom. c) At least two types of atoms are required to make a compound. d) Mixtures can be made of two elements, two compounds, or an element & a compound.

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3 years ago

Nail polish remover containing acetone was spilled in a room 7.2 m × 5.8 m × 3.9 m. Measurements indicated that 6,400 mg of acet

sergeinik [125]

Volume of room = $7.2 m \times 5.8 m \times 3.9 m$

= $162.864 m^{3}$

Now, according to conversion factor, convert 6,400 mg to micrograms

Since, 1 mg is equal to 1000 microgram.

Therefore, 6,400 mg = $6,400 \times 1000$

= 6,400,000 micrograms of acetone.

To calculate concentration of acetone, divide volume and evaporated amount of acetone in micrograms.

Thus,

Concentration of acetone = $\frac{6,400,000 microgram}{162.864 m^{3}}$

= 39296.5910 microgram per cubic meter or $3.92\times 10^{4} \mu g/m^{3}\simeq 4.0\times 10^{4} \mu g/m^{3}$

Hence, concentration of acetone is equal to $4.0\times 10^{4} \mu g/m^{3}$

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3 years ago