Which orders the activities from the greatest to least impact to reduce consumption of fossil fuels? drive an electric car to work, walk to work, carpool to work

Carpool to work, walk to work, drive an electric car to work

walk to work, carpool to work, drive alone to work

drive alone to work, drive an electric car to work, carpool to work

drive an electric car to work, walk to work, carpool to work

Explanation:

The orders of the activities from the greatest to least impact to reduce consumption of fossil fuels, is one in which the least fossil fuel is used;

The goal of driving an electric car is to reduce dependence on fossil fuels. Electric cars prides as an automobile system with no carbon emission nor usage. Walking to work does not require carbon consumption too. Carpool involves use of fossil fuels.

1. Balance the reaction
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag 
2. Find the limiting [divide moles of reactant by their balancing numbers]
Cu: 4.2/1 =4.2 
AgNO3: 6.3/2= 3.15 
AGNO3 is the limiting
How many moles of silver metal will be formed?
The ratio between the limiting reactant and silver is 2:2 or 1:1
therefore 6.3 moles of silver will be formed.

How many moles of excess reactant will be left?
Since each mole of copper is equal to 2 moles of AgNO3. divide 6.3 by 2 then minus it from coppers moles
6.3/2 = 3.15
4.2-3.15 = 1.05 moles of copper will be left