Question

Which of the following contains less number of molecules
A.11g of co2
B.32g of so2
C.2 g of hydrogen
D.4 g of helium

Answer 1

Answer:

c

Explanation:

because atomic number of hydrogen is 1

then 2 g of hydrogen includes 2 molecules

Answer 2

Explanation:

A. So the answer is 3.01 x 10 to the 23rd carbon atoms in 22 g of CO2. ... relative molevular mass of co2 is 44.(O=16,C=12).so the number of atoms in 44g is 6.022×10^23(avegadro constant).therefore the number of carbon atoms in 22g is 6.022×10^23/2.as in one atom there is only one atom of carbon.

B.32g of SO2 reacts with 48g of O2 to produce SO3. Calculate and find out the limiting reagent in the manufacture of SO3 

C.Molar mass of H2H2 is 2g

2g of H2H2  Contains $6.023\times10^{23} molecules

200mg = 0.2 g

0.2 g of  H2H2  Contains --------?

=0.2×6.023×10232=6.023×1021=0.2×6.023×10232=6.023×1021 molecules

The number of molecules present in 0.2 g of  H2is2.737×1021

D.Atomic mass of He = 4 g, Na = 23 g, Ca = 40 g) ... Alpha particles contains helium ions or atoms or nucleus?if it contains helium nuclei then how this alpha