How much energy is added to change 180g of liquid water to gas at 100 degrees Celsius

Chemistry

1 answer:

Finger [1]3 years ago

7 0

Answer:

40.7 kJ

Step-by-step explanation:

The formula for the heat, q, needed to evaporate a liquid is

q = mΔHvap

Data:

m = 180 g

ΔHvap = 2260 J/g

Calculation:

q = 180 g × 2260 /1

q = 40 700 J = 40.7 kJ

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Which of these laboratory techniques is best to separate a solid from a liquid to recover the liquid? f chromatography g filteri

galina1969 [7]

Answer:
Filtering is best laboratory technique to separate a solid from a liquid to recover the liquid.

Explanation:
A solid particles present in liquids can be separated from liquid by utilizing a membrane having pores large enough to allow the liquid molecules to pass through and small enough to stop the solid particles from crossing.

Example:
Tea Filters are used to separate Tea from the grounds.

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3 0

3 years ago

For an alloy that consists of 91.0 g copper, 111 g zinc, and 7.51 g lead, what are the concentrations (a) of Cu (in at%), (b) of

viktelen [127]

Answer:

$\% Cu=45.2\%\\\\\% Zn=53.6\%\\\\\% Pb=1.2\%$

Explanation:

Hello!

In this case, given the masses of copper, zinc and lead, it is possible to compute the moles via their atomic masses first:

$n_{Cu}=\frac{91.0gCu}{63.55g/mol}=1.432mol\\\\ n_{Zn}=\frac{111gZn}{65.41g/mol}=1.697mol\\\\n_{Pb}=\frac{7.51gPb}{207.2g/mol}=0.0362mol\\$

Now, we compute the atomic percentages as shown below:

$\% Cu=\frac{1.432}{1.432+1.697+0.0362}*100\% =45.2\%\\\\\% Zn=\frac{1.697}{1.432+1.697+0.0362}*100\%=53.6\%\\\\\% Pb=\frac{0.0362}{1.432+1.697+0.0362}*100\%=1.2\%$