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natka813 [3]
3 years ago
12

Can someone help me with this

Chemistry
2 answers:
andrezito [222]3 years ago
6 0
It takes time for the lava to push out
ruslelena [56]3 years ago
4 0
Because it takes time for the pressure to build enough to push the lava out.
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A solution contains an unknown mass of dissolved barium ions. When sodium sulfate is added to the solution, a white precipitate
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Answer:

0.1388 g

Explanation:

The mass of BaSO_4 obtained on precipitation = 236 mg

1 mg = 0.001 g

Thus, Mass of BaSO_4 = 0.236 g

Molar mass of BaSO_4 = 233.43 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{0.236\ g}{233.43\ g/mol}

Moles of BaSO_4 = 0.001011 moles

According to the reaction,

Ba^{2+}+SO_4{2-}\rightarrow BaSO_4

Thus, moles of barium = 0.001011 moles

Molar mass of barium = 137.327 g/mol

Thus, Mass = Moles * Molar mass = 0.001011*137.327 g = 0.1388 g

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Mg​ +2​+ 2e- → Mg oxidation or reduction
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Knowing the chemical properties of a substance will tell you how the substance
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