Question

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

Solution

Correct option is

27

 

If m is the atomic mass of the element M, then 2m + 48 g of M2O3contain O = 48 g

  

or 2 m = 42.56 or = 26.28 ≈ 27 

SIMILAR QUESTIONS

Q1

 

 In the reaction,

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

Q2

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

Q3

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

Q4

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

Q5

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

Q6

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?

Q7

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  

Q8

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

Q9

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

Q10

80 g of oxygen contain as many atoms as in