Question

question number 1 which one of the following has highest number of molecules and how 7 gram of Nitrogen or one gram of hydrogen...2what mass of hydrogen will react with 22.4 litre of oxygen at ntp to produce 36 gram of water 3.calculate the number of molecules of hydrogen and carbon atoms present in 4 gram of Methane ​

Answer 1

1)For a molecule,

molecular weight in grams = Avogadro's number(N

A

)=6.023×10

23

(A) 1g CO

2

44 gram of CO

2

=N

A

molecules

∴ 1 gram of CO

2

contains

44

1

×N

A

molecules

(B) 1g N

2

28 gram of N

2

=N

A

molecules

∴1 gram of N

2

contains

28

1

×N

A

molecules

(C) 1g H

2

2 gram of H

2

contains N

A

molecules

∴ 1 gram of H

2

contains

2

1

×N

A

molecules

(D) 1g CH

4

16 gram of CH

4

=N

A

molecules

∴ 1 gram of CH

4

=N

A

/16

Maximum number of molecules are found in 1 gram hydrogen.

2)This question has more information than you need to answer but…

At STP, one mole of any gas (ideal, of course) will occupy 22.4 L so we have 1 mole of oxygen (O2). You can calculate the number of moles, if you wish with

PV=nRT or, for n, n= PV/RT

At STP, P = 1 atm, T = 273 K, R is the gas constant (=0.082 atm-L/mol-K) and we are given the V = 22.4. So, the number of moles is:

n= PV/RT = (1 * 22.4)/(0.082 * 273) = 1 mole.

The reaction in question is:

2 H2 + O2 → 2 H2O

So, you need twice as much of H2 as O2 or 2 moles of H2. Hydrogen molecular weight is 2.016 g/mole and you need two moles or 4.032 g.

Note that 1 mole of oxygen (O2) has a mass of 32 g so when you add the hydrogen to get water the total mass should be 32+4 or 36 g (rounding things off).

3)=Molar Mass of 1 molecule of methane(CH4) = 12 + 4 = 16g/mol

That is, 16g if CH4 contain 1 mole molecule of it

= 6.022×10²³ molecules of CH4 which consists of 1 mole of C atoms and 4 moles of H atoms.

=> 4 g of CH4 contains 1/4 × 6.022×10²³ molecules

= 1.5055×10²³ molecules of CH4

= 1.5055×10²³ C atoms and 6.022×10²³ H atoms

Note: the question should be how many atoms of hydrogen and carbon and not molecules.

Hope it helps…

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Answer 2

Answer:

1gram of CO answer right