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It has been estimated that 93% of all at...

It has been estimated that 93% of all atoms in the entire universe are hydrogen and that the vast majority of those remaining are helium. Based on only these two elements, estimate the mass percentage composition of the universe.

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To estimate the mass percentage composition of the universe based on the given information about hydrogen and helium, we can follow these steps: ### Step 1: Determine the percentage of hydrogen and helium - It is given that 93% of all atoms in the universe are hydrogen, and the remaining 7% are helium. ### Step 2: Calculate the average atomic mass of hydrogen and helium - The atomic mass of hydrogen (H) is approximately 1 gram/mol. - The atomic mass of helium (He) is approximately 4 grams/mol. ...
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RC MUKHERJEE-ELEMENTARY PROBLEMS BASED ON DEFINITION OF MOLE: THE MOLE CONCEPT -OBJECTIVE PROBLEMS
  1. It has been estimated that 93% of all atoms in the entire universe are...

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  2. The density of chlorine relative to air is

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  3. A gaseous nitrogen oxide contains 30.4% of nitrogen, one molecule of w...

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  4. The mass of an oxygen atom is half that of a sulphur atom. Can we deci...

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  5. Density of air is 0.001293 g ml. Its vapour density is

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  6. 5.6 litres of oxygen at NTP is equivalent to

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  7. 22.4 litre of water vapour at NTP, When condensed to water occupies an...

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  8. Which of the following has the highest mass?

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  9. 6.022 xx 10^(22) molecules of N(2) at NTP will occupy a volume of

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  10. How many grams are contained in 1 gram-atom of Na?

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  11. The weight of 350 ml a diatomic gas at 0^(@)C and 2atm pressure is 1 g...

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  12. The number of atoms present in 16 g of oxygen is:

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  13. 1 mole of a compound contains 1 mole of C and 2 moles of O. The molecu...

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  14. The volume of a gas at 0°C and 700 mm pressure is 760 cc. The number o...

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  15. 1 mole of a diatomic element X2 contains 34 and 40 moles of electrons ...

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  16. 2 moles of H atoms at NTP occupy a volume of:

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  17. Number of electrons in 1.8 grams of H(2)O are

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  18. Molecular weight of a gas, 11.2 litres of which at NTP weighs 14 g, is

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  19. The weight of 1 mole of a gas of density 0.1784 g/L at NTP is

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  20. Number of HCl molecules present in 10 mL of 0.1 N HCl solution is

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  21. Number of atoms in 12 g of ""(6)^(12) C is :

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