Tag: introduction to analytical chemistry

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Questions Related to introduction to analytical chemistry

Multiple choice chemistry introduction to analytical chemistry percent composition water of crystallisation percentage composition and empirical formula

% composition requires ................ of the compound :

  1. molar mass

  2. temperature

  3. atmospheric pressure

  4. both a and b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The present composition (by mass) of a compound can be calculated by dividing the mass of each element by the total mass of the compound. i.e. by calculating the $molar$ $mass$ of the compound.

Multiple choice chemistry introduction to analytical chemistry different types of solutions various mixtures introduction to solutions

What volume would you dilute 0.2 L of a 15 M solution to obtain a 3 M solution?

  1. 1L

  2. 225L

  3. 10L

  4. 0.4L

  5. 0.1L
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
We know that :

$\displaystyle M _1V _1 = M _2V _2 $ 

Given :

$\displaystyle  M _1 = 15 $  M
$\displaystyle V _1 = 0.2 $ L
$\displaystyle  M _2 =3$  M
$\displaystyle  V _2 =$  ????

$\displaystyle  15 \times 0.2 = 3 V _2$
Thus, $\displaystyle  V _2 = 1$  L

Hence, the correct option is A.