How many mol of hydrogen in 2.7 mol of caffeine?

Answer : The number of moles of hydrogen in 2.7 mole of caffeine are 27 moles.

Explanation : Given,

Moles of caffeine = 2.7 mole

The molecular formula of caffeine is,

In the molecule , there are 8 moles of carbon, 10 moles of hydrogen, 4 moles of nitrogen and 2 moles of oxygen.

As, 1 mole of contains 10 moles of hydrogen

So, 2.7 moles of contains moles of hydrogen

Therefore, the number of moles of hydrogen in 2.7 mole of caffeine are 27 moles.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.