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3 years ago

Help pls true or false

Chemistry

1 answer:

makvit [3.9K]3 years ago

7 0

Answer:

1 oxygen from the lungs

Explanation:

maybe too help you breath better

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Write balanced complete ionic equation for hcl(aq)+lioh(aq)→h2o(l)+licl(aq)

olga2289 [7]

<span>H and Li have a +1 charge. Cl and OH have a -1 charge. When written out it should look like this: H(+1) + Cl(-1) + Li(+1) + OH(-1) --> H2O + Li(+1) + Cl(-1) if you wanted the net ionic equation it would be: H(+1) + OH(-1) --> H2O</span>

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4 years ago

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A county creates an park to protect a forest.

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A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of X and the percent by mass of

Hitman42 [59]

Answer:

Molar masses of X and Z

Explanation:

To determine the mole percent of a mixture ( mole percent of unknown metals = number of mole of each of them divided the total of both the unknown salt × 100) since the percent by mass is know; we the molar mass of X and Z

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3 years ago

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How many moles are in 17.2g k2s

Natalija [7]

Answer: 0.156 mol

Explanation:

To find the moles of 17.2 g K₂S, we need to know the molar mass to convert.

$17.2g*\frac{mol}{110.256 g} =0.156 mol$

3 0

4 years ago

Determine the volume of distilled water that should be added to 20.0 mL of 12.0 M HCl(aq) in order to prepare a 0.500 M HCl(aq)

BARSIC [14]

Answer:

$V_{H_2O}=460 mL$

Explanation:

Hello!

In this case, in a dilution process, water is added to a solute in order to decrease its concentration but increase the volume of the solution. It means that if we have 20.0 mL of a 12.0-M solution of HCl and we want a 0.500-M solution, we need to apply the following formula considering that the moles remain unchanged:

$M_1V_1=M_2V_2$

Thus, solving for the final volume is:

$V_2=\frac{M_1V_1}{M_2}$

So plugging in the values we obtain:

$V_2=\frac{12.0M*20.0mL}{0.500M}\\\\V_2=480 mL$

Now, since the initial volume of acid was 20.0 mL and the final volume is 480 mL, the added volume of distilled water is:

$V_{H_2O}=480-20=460 mL$

Best regards!

8 0

3 years ago