Calculate the net charge on a substance con- sisting of a combination of 9.0 x 10^13 protons and 4.1 x 10^13 electrons. the elemental charge is 1.6 x 10-19 c. answer in units of c.

Net charge,

Explanation:

Number of protons,

Number of electrons,

Charge on electron,

Charge on proton,

Net charge acting on the substance is :

or

So, the net charge on the substance is . Hence, this is the required solution.

c.the charges if the proton and electron and gravity

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂