Which of the following statements regarding the moon and earth is correct? a. earth and the moon are nearly the same age. b. earth and the moon have nearly the same mass. c. earth is tidally locked, while the moon spins on its axis. d. the moon is older than earth by approximately 300 million years.

Option 'D' is correct.

Explanation:

Earth has one natural satellite i.e. "Moon".

Earth spins on its axis due to moon is tidally locked.

The mass of moon is much greater than the mass of earth.

The age of moon is much older than the age of Earth.

The moon is older than Earth by approximately 300 million years.

so, only one statement is  correct i.e. 'D'.

Hence, Option 'D' is correct.

  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