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3 years ago

8

___ is the diffusion of water molecules across a

1 answer:

Gre4nikov [31]3 years ago

4 0

I think the answer is osmosis

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What are two things that you observed when you heated the mixture of tin and nitric acid over the Bunsen burner in the virtual l

Simora [160]

Sn + 4 HNO₃ → SnO₂ + 4 NO₂ + 2 H₂O

Heating was required to get rid of the H₂O. When all moisture is gone, you weigh the sample. After which, you further heat it to get ride of the oxygen. By doing this, you would know the individual mass of each element. Then, you can solve for the empirical formula of the oxide of tin.

Hope this helps best of luck :)

7 0

4 years ago

The decomposition of 3.32 g CaCO3 yields 1.24 g CaO. What is the percent yield of this reaction? (CaCO3 --> CaO + CO2)

alex41 [277]

Answer:

66.57%

Explanation:

The decomposition reaction of calcium carbonate is shown below as:

$CaCO_3\rightarrow CaO+CO_2$

Calculation of moles of $CaCO_3$ :

Amount = 3.32 g

Molar mass of $CaCO_3$ = 100 g/mol

The formula for the calculation of moles is shown below:

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

Thus, moles are:

$moles= \frac{3.32\ g}{100\ g/mol}$

$moles= 0.0332\ mol$

According to reaction,

0.0332 moles of $CaCO_3$ decomposes to yield 0.0332 moles of $CaO$

Theoretical yield = 0.0332 moles

Calculation of moles of $CaO$ formed as:

Amount = 1.24 g

Molar mass of $CaO$ = 56 g/mol

The formula for the calculation of moles is shown below:

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

Thus, moles are:

$moles= \frac{1.24\ g}{56\ g/mol}$

$moles= 0.0221\ mol$

Experimental yield = 0.0221 moles

$Yield\%=\frac {Experimental yield}{Theoretical yield}\times 100$

Thus,

$Yield\%=\frac {0.0221}{0.0332}\times 100$

<u>Percent yield = 66.57%</u>

5 0

4 years ago

A 12.5L container of neon had a pressure change

Elan Coil [88]

Answer: V= 44. 6 L

Explanation: use Boyle's Law

P1V1 = P2V2

Derive to find V2:

V2 = P1V1 / P2

= 937.57 Pa( 12.5 L ) / 262.52 Pa

= 44.6 L

5 0

4 years ago

Which of the following atoms will form an ion with the most negative charge?

bekas [8.4K]

Answer:

hi i don't know the answer to this

3 0

3 years ago

Platinum-189<br> What is the symbol

Fed [463]

Answer:

platinum-189 symbol is PT

6 0

3 years ago