Yeast convert glucose to ethanol and carbon dioxide during anaerobic fermentation as depicted in the simple chemical equation here:
glucose ? ethanol + carbon dioxide
(a) if 200.0 g of glucose is fully converted, what will be the total mass of ethanol and carbon dioxide produced?
(b) if the fermentation is carried out in an open container, would you expert the mass of the container and contents after fermentation to be less than, greater than, or the same as the mass of the container and contents before fermentation?
explain.
(c) if 97.7 g of carbon dioxide is produced, what mass of ethanol is produced

Explanation:

a)C₆H₁₂O₆ = 2C₂H₅OH + 2CO₂

180g               92g            88g

180g glucose gives 88g carbon dioxide and 92g ethanol

200g glucose gives 88/180 x 200 co₂ and 92/180 x 200 g ethanol

ethanol 102.22g , CO₂  97.77g

b) No change in mass after fermentation if we take into account mass of all the product.

c) ethanol produced =102.22g

200

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.