3 years ago

In what month does winter begin in the southern hemisphere

Chemistry

2 answers:

Katyanochek1 [597]3 years ago

7 0

In the Southern Hemisphere this would be around June 20 and culminates on September 22.

ruslelena [56]3 years ago

3 0

Winter begins in June and ends in September

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Consider a balloon that has a volume V. It contains n moles of gas, it has an internal pressure of P, and its temperature is T.

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B.) it stays the same

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3 years ago

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No uso dos cosméticos, as embalagens representam uma ferramenta de comunicação extremamente importante e que segue uma legislaçã

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3 years ago

What is the volume of a salt crystal measuring 1.64 x 10^-2m by 1.5 x 10^-2m by 4.8 x 10^-3

lubasha [3.4K]

Answer:

V = 1.2 × 10⁻⁶ m³

Explanation:

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4 years ago

How many moles are in 38 grams of Argon? Round to 2 decimal places. Use "e" for exponents

yuradex [85]

Answer: 39.948

Explanation:

How many grams Argon in 1 mol? The answer is 39.948. We assume you are converting between grams Argon and mole. You can view more details on each measurement unit: molecular weight of Argon or mol The molecular formula for Argon is Ar.

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3 years ago

How many acetone molecules are in a bottle of acetone with a volume of 445 mL ? (density of acetone = 0.788 g/cm3).

Mkey [24]

<h2>Hello!</h2>

The answer is: $3.63x10^{24}particles$

First, we need to calculate the molecular weight of the acetone (CH3COCH3)

So,

$C=12.011g/mol\\O=15.99g/mol\\H=1.008g/mol$

Then,

$CH3COCH3=12.011+(1.008)*3+12.011+15.999+12.011+(1.008)*3=58.08g/mol$

Second, we need to calculate the mass of the acetone in the bottle

We need to remember that $1cm^{3}=1mL$

So,

$445cm^{3}*\frac{0.788g}{cm^{3}}=350.66g$

Third, we need to calculate the number of moles:

$350.66g*\frac{1mol}{58.08g}=6.03moles$

Fourth, we need to calculate the number of atoms:

Remember, $1 mol=6.022x10^{23}particles$

Therefore,

$6.03moles*\frac{6.022x10^{23}particles }{1mol}=3.63x10^{24}particles$

Have a nice day!

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4 years ago

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