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3 years ago

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

1 answer:

5 0

The answer is evaporation<span>.Evaporation is the vaporization of the liquid from its surface into gaseous phase, without boiling the liquid. When all the liquid has passed to gaseous phase the salt dissolved in the salt water will remain as solid crystals.</span><span />

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A block of iron has a mass of 150 g and a volume of 20 ml. What is the density of iron? *

shtirl [24]

Answer:

<h3>The answer is 7.50 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of iron = 150 g

volume = 20 mL

We have

$density = \frac{150}{20} = \frac{15}{2} \\$

We have the final answer as

Hope this helps you

4 0

3 years ago

Read 2 more answers

What force pulls electrons and protons together?

ruslelena [56]

Electrostatic force ..

7 0

3 years ago

3. How many moles of NaCl are present in 6000. La 1.5 M NaCl solution?

Leno4ka [110]

Answer:

Option A (9.0) is the correct alternative.

Explanation:

The given values are:

Molarity,

= 1.5 M

Volume,

= 6000 mL

or,

= 6 L

As we know,

⇒ $Molarity=\frac{Moles}{Volume}$

or,

⇒ $The \ moles \ of \ NaCl=Molarity\times Volume$

By putting the values, we get

$=1.5\times 6$

$=9 \ mol$

7 0

3 years ago

Ammonia (NH3) can be produced by the reaction of hydrogen gas with nitrogen gas:

sp2606 [1]

B) 40%
The balanced equation indicates that for every 3 moles of H2 used, 2 moles of NH3 will be produced. So the reaction if it had 100% yield would produce (2.00 / 3) * 2 = 1.333333333 moles of NH3. But only 0.54 moles were produced. So the percent yield is 0.54 / 1.3333 = 0.405 = 40.5%. This is a close enough match to option "b" to be considered correct.

3 0

3 years ago

Read 2 more answers

Assuming a total pressure of 9.3 atmatm , what is the partial pressure of helium in the mixture of 98%% helium and 2.0%% oxygen

Paladinen [302]

Answer:

D0wnload Phot0Math......................

Explanation:

7 0

3 years ago