Which starting condition would produce the larger volume of carbon dioxide by combustion of ch4(g) with an excess of oxygen gas to produce carbon dioxide and water: (a) 2.00 l of ch4(g); (b) 2.00 g of ch4(g)? justify your answer. the system is maintained at a temperature of 75 c and 1.00 atm.

(b) 2.00 g of CH4(g)

Explanation:

(a) 2.00 L of

Volume = 2.00 L

Temperature = 75°C

Pressure = 1.00 atm

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (75 + 273.15) K = 348.15 K  

T = 348.15 K

Using ideal gas equation as:

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

1.00 atm × 2.00 L = n × 0.0821 L.atm/K.mol ×  348.15 K

⇒n = 0.07 moles

(b) 2.00 g of

Mass of = 2.00 g

Molar mass of = 16.04 g/mol

The formula for the calculation of moles is shown below:

Thus,

Moles of = 0.125 moles

Thus, more moles, more volume of carbon dioxide will be produced when more moles of methane react.

So, Answer - (b) 2.00 g of CH4(g)

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.