A/1 * b/c = d you discover a chemical reaction that produces 2 moles of valuable propane for every 7 moles of carbon supplied. essentially, this is an exchange rate of 2 moles of propane for every 7 moles of carbon. if you have 1.4 moles of carbon, how many moles of propane can you produce using this reaction?

As per the problem 2 moles of propane are produced when 7 moles of carbon are supplied

so if we supply 1 mole of carbon the moles of propane obtained = 2 /7

if we supply 1.4 moles of carbon the moles of propane obtained = 2 X 1.4 /7 = 0.4 moles of propane

Hence answer is  propane we can produce using this reaction = 0.4 moles from 1.4 moles of carbon

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.