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3 years ago

How do I balance Sn + NaOH >Na2SnO2 + H2

Chemistry

1 answer:

Inessa [10]3 years ago

3 0

Answer:

Explanation:

Sn + 2NaOH--> Na2SnO2 + H2

-Just add a 2 in front of the NaOH! :)

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What mass of cu(s)cu(s) is electroplated by running 14. 5 aa of current through a cu2 (aq)cu2 (aq) solution for 4. 00 hh?

galina1969 [7]

The mass of Copper electroplated is 68.76 g

<h3>What is electroplating?</h3>

The process of plating a metal onto another is known as electroplating.

It is often used to prevent corrosion of metal or for the decorative purposes

In this process, electric current is passed through an aqueous solution containing dissolved cations.

The dissolved cations are reduced developing a thin metal coating on the electrode.

At cathode,

$Cu^{2+}(aq) + 2e^-\rightarrow Cu(s)$

Current, I = 14.5 A

Time, t = 4 hrs = 4×60×60 = 14400 sec

Charge, q = It = 14.5×14400= 208800 C

Copper metal deposited by 2×96487 C = 63.55 g

Copper metal deposited by 208800 C = $\frac{63.55 \times208800}{2\times96487}$

= 68.76g

Hence, The mass of Copper electroplated is 68.76 g

Learn more about electroplating:

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2 years ago

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Why is it important to conserve both nonrenewable and renewable resources?

Maru [420]

It is important to conserve non renewable sources of energy such as coal and oil because they are running out. If we burn all the oil to generate electricity then there will be none left for other useful things we use oil for.

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3 years ago

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Name these molecules.<br> Number 8 is on top and 7 on bottom.

Aleonysh [2.5K]

7. 6-ethyl-2-octene

8. 2-methyl-propane

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3 years ago

Find the mass of nitrogen trioxide (NO2) that occupies 156 L at STP.

gtnhenbr [62]

Considering the definition of STP conditions, the mass of nitrogen trioxide (NO₂) that occupies 156 L at STP is 320.16 grams.

<h3>Definition of STP condition</h3>

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

<h3>Mass of nitrogen trioxide</h3>

In this case, you can apply the following rule of three: if by definition of STP conditions 22.4 liters are occupied by 1 mole of nitrogen trioxide, 156 L are occupied by how many moles of nitrogen trioxide?

$amount of moles=\frac{156 L x 1 mole}{22.4 L}$

<u><em>amount of moles= 6.96 moles</em></u>

The molar mass of nitrogen trioxide is 46 g/mole. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 46grams, 6.96 moles of the compound contains how much mass?

$mass=\frac{6.96 moles x 46 grams}{1 mole}$