A problem that the Hudson River still faces is pollution
Answer:
a message sent by telegraph and then delivered in written or printed form, used in the UK only for international messages since 1981
Answer: e. YqhD gene
Explanation:
The researchers showed that most of the isobutanol produced in E.coli strains is due to the action of the alcohol dehydrogenase YqhD. Remember that E. coli has several genes encoding for alcohol dehydrogenases.
They deleted the yqhD gene and found a 80% reduction in isobutanol production.
Answer:
(a) The amount of O2 needed is 2.67 pounds.
(b) The volume required is 847,509 litres.
(c) The heat given off as a result of the combustion to CO2 is 393.5 kJ.
Explanation:
For a complete combustion of C to C02(g)
![C+O_{2} \rightarrow CO_{2}](https://tex.z-dn.net/?f=C%2BO_%7B2%7D%20%5Crightarrow%20%20CO_%7B2%7D)
(a) The molecular mass of O2 is 32 g/mol and the molecular mass of C is 12 g/mol.
We need 1 mol O2 to burn 1 mol of C.
If we need 32 g of O2 to burn 12 g of C, to burn 1 pound of pure carbon charcoal we need (32/12)*1=2.67 pounds of O2.
(b) The density of O2, at atmospheric conditions, is 1.429 g/l. The volume of 2.67 pounds of O2 is
![V=M/\rho=(2.67 lb)*(\frac{1 l}{1.429 g})*(\frac{453,592 g}{1lb}) =\frac{1,211,090}{1.429}= 847,509 l](https://tex.z-dn.net/?f=V%3DM%2F%5Crho%3D%282.67%20%20lb%29%2A%28%5Cfrac%7B1%20l%7D%7B1.429%20g%7D%29%2A%28%5Cfrac%7B453%2C592%20g%7D%7B1lb%7D%29%20%3D%5Cfrac%7B1%2C211%2C090%7D%7B1.429%7D%3D%20847%2C509%20l)
(c) To calculate the heat of the reaction, we have to look up in the Table of Standard Enthalpy of Formation Values and compute the following equation
![\Delta H_{reaction}^{o}=\sum\Delta H_{f}^{o} (products)-\sum\Delta H_{f}^{o}(reactants)\\\\\Delta H_{reaction}^{o}=\Delta H_{f CO_{2}}^{o}-(\Delta H_{fO_{2}}^{o}+\Delta H_{fC}^{o})\\\\\Delta H_{reaction}^{o}=(1 mol) *(-393.5 kJ/mol)-((1mol)*(0 kJ/mol)+(1mol)*(0 kJ/mol))\\\\\Delta H_{reaction}^{o}=-393.5 kJ](https://tex.z-dn.net/?f=%5CDelta%20H_%7Breaction%7D%5E%7Bo%7D%3D%5Csum%5CDelta%20H_%7Bf%7D%5E%7Bo%7D%20%28products%29-%5Csum%5CDelta%20H_%7Bf%7D%5E%7Bo%7D%28reactants%29%5C%5C%5C%5C%5CDelta%20H_%7Breaction%7D%5E%7Bo%7D%3D%5CDelta%20H_%7Bf%20CO_%7B2%7D%7D%5E%7Bo%7D-%28%5CDelta%20H_%7BfO_%7B2%7D%7D%5E%7Bo%7D%2B%5CDelta%20H_%7BfC%7D%5E%7Bo%7D%29%5C%5C%5C%5C%5CDelta%20H_%7Breaction%7D%5E%7Bo%7D%3D%281%20mol%29%20%2A%28-393.5%20kJ%2Fmol%29-%28%281mol%29%2A%280%20kJ%2Fmol%29%2B%281mol%29%2A%280%20kJ%2Fmol%29%29%5C%5C%5C%5C%5CDelta%20H_%7Breaction%7D%5E%7Bo%7D%3D-393.5%20kJ)
The heat given off as a result of the combustion to CO2 is 393.5 kJ.
It means a new stage or a new chapter of a process!