2 years ago

Motion of falling object towards the earth is variable motion

Chemistry

1 answer:

slamgirl [31]2 years ago

8 0

Answer:

Yes , it is due to gravity , structure of earth,air resistance so ...

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The atomic number of polassium and

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Atomic radius decreases from left to right in a period.

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For an organism’s scientific names, the first part is the ________ and the second is the ________.

kari74 [83]

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Explanation:

For an organism scientific names the first part is the genus and the second is the species

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Q2. 0.254 g of KHP (204 g/mol) titrated against 20.0 mL of unknown NaOH (40.0 g/mol) solution to get the end point of phenolpht

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Answer:

Mass concentration (g/L) = 2.49g/L.

Explanation:

No. of moles = $\frac{mass}{molar mass}$

= $\frac{0.254}{204}$ = 0.001245 moles

Concentration of KHP (C1) in litres = n/v

= $\frac{0.001245}{0.02}$ = 0.062 mol/L

We know that:

$C_{1} V_{1}$ = $C_{2} V_{2}$

where c1v1 and c2v2 are the products of concentration and volumes of KHP and NaOH respectively.

Since mole ratio is 1 : 1.

1 mole of NaOH - 40g

0.001245 mole of NaOH = 40 × 0.001245 = 0.0498g

⇒0.0498g of NaOH was used during the titration

∴Mass concentration (g/L) = 0.0498g ÷ 0.02L

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Explanation in attached image

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