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tatiyna
3 years ago
12

How much Sr(OH)2 • 8 H2O (M = 265.76) is needed to

Chemistry
1 answer:
Degger [83]3 years ago
3 0
First, you need to find the number of moles of OH⁻ in a 250mL solution of 0.100M OH⁻.  To do this, multiply 0.250L by 0.100M to get 0.025mol OH⁻.  Then you use the fact that 1 mole of Sr(OH₂)·8H₂O contains 2 moles of OH⁻ which means that 0.0125mol of Sr(OH)₂·8H₂O contains 0.025mol OH⁻ (0.025/2=0.0125).  Then to find the amount of Sr(OH)₂·8H₂O is needed you multiply its molar mass (265.76g/mol) by 0.0125mol to get 3.322g.
Therefore you need 3.322g of Sr(OH)₂·8H₂O.

I hope that helps.  Let me know if anything is unclear.
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A mixture of gases at a total pressure of 95 kPa contains N₂, CO₂, and O₂. The partial pressure of the CO₂ is 24 kPa and the par
Zinaida [17]

Answer:

23 kPa = Partial pressure O₂

Explanation:

In a mixture of gases, the sum of partial pressure of each gas that contains the mixture = Total pressure

Total pressure = Partial pressure N₂ + Partial pressure CO₂ + Partial pressure O₂

95 kPa = 48 kPa + 24 kPa + Partial pressure O₂

95 kPa - 48 kPa - 24 kPa = Partial pressure O₂

23 kPa = Partial pressure O₂

7 0
3 years ago
What is the difference between an atom and an element? a An atom cannot be cut into smaller, but an element is a group of atoms
miss Akunina [59]

Answer:

c.

Explanation:

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3 years ago
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sashaice [31]
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PPRR, PpRR, PPRr, and PpRr
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valentina_108 [34]

Answer:

Substance 4

Explanation:

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Since the density of water is 1 g/cm^3, any substance whose density is less than that of water will float in it.

If we look at the table, substance 4 has a density of 0.5g/cm^3. Hence, substance 4 is expected to float in water.

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