Question

0.1 mole of a carbohydrate with empirical formula CH2O contains 1 g of hydrogen. What is its molecular formula? 

Solution

Correct option is

C5H10O5

 

0.1 mole of carbohydrate with E.F. CH2O contains 1 g of hydrogen.

             = 10 g = 10 g atoms

In CH2O, g atomic ratio of C: H : O = 1 : 2 : 1.

With 10 g atom of H , g atoms of C combined = 5 and g atoms of O combined = 5. Hence, actual formula (molecular formula) will be C5H10O5.

SIMILAR QUESTIONS

Q1

 

An element X has the following isotopic composition:

                            200X : 90%

                            199X : 8.0%

                            202X : 2.0%

The weight average atomic mass of the naturally occurring element X is closest to :

Q2

 

 In the reaction,

      2 Al(s) + 6 HCl (aq) → 2 Al3+(aq) + 6 Cl (aq) + 3 H2 (g)

Q3

The crystalline salt Na2SO4.xH2O on heating losses 55.9% of its weight. The formula of the crystalline salt is 

Q4

10 litres of O2 gas is reacted with 30 litres of CO at STP. The volume of each gas present at the end of the reaction are

Q5

0.3 g of an acid is neutralised by 40 cm3 of 0.125 N NaOH. Equivalent mass of the acid is 

Q6

Volume occupied by one molecule of water (density = 1 g cm–3)is

Q7

What volume of oxygen gas (O2) measured at 0oC and 1 atm is needed to burn completely 1 L of propane gas (C3H8messured under the same conditions?

Q8

An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave C, 38.71 % and H, 9.67%. The empirical formula of the compound would be  

Q9

How many moles of lead (II)chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl

Q10

The percentage of an element M is 53 in its oxide of molecular formula M2O3. Its atomic mass is about