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meriva
3 years ago
8

Plz help, have a quiz on this plz PLZ

Chemistry
1 answer:
katovenus [111]3 years ago
7 0

Answer:

20.82

Explanation:

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How many grams are in 2.3 x 10^-4 moles of Ca3(PO4)2
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Molar mass 

Ca₃(PO₄)₂ = 310 g/mol

1 mole -------------------> 310 g
2.3x10⁻⁴ mole ---------> ?

m = 2.3x10⁻⁴ * 310 / 1

m = 0.0713 g 

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3 years ago
When 15.0 g of fluorite (CaF₂) reacts with excess sulfuric acid, hydrogen fluoride gas is collected at 744 torr and 25.5°C. Soli
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The reaction equation is:  CaF₂ + H₂SO₄ → 2HF + CaSO₄

The molar ratio between fluorite and hydrogen fluoride is 1 : 1.

The moles of fluorite supplied are:

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The moles of hydrogen fluoride produced will be 0.2.Now, we may use the ideal gas equation to determine the temperature:

PV = nRT                                            T = PV/nR

T = (875 * 8.63) / (0.2 * 62.36)

T = 605.45K

The temperature will be 331.85 °C  which is  required to store the gas in an 8.63-L container at 875 torr.

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2 years ago
18. What is the density of a substance with a mass of 0.90 kg and a volume of 1.2 mL?
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fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

Explanation:

4 0
3 years ago
Which plate, oceanic or continental, must be more dense?
musickatia [10]

Answer:

Oceanic & Continental Plates

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3 years ago
Chlorine has an atomic number of 17.
zlopas [31]

Answer:

A. 17

Explanation:

6 0
3 years ago
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