The total length of mid-ocean ridge spreading centers is about 80,000 km. The average
spreading rate of ridges is 1.25 cm/yr. Calculate the area of new
ocean crust that forms each year.

In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).

Explanation:

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g