Correct Answer: C. death

Correct Answer: B. simple bar graph

Correct Answer: C. Biological method

Correct Answer: C. provides foreign market for local goods

Correct Answer: C) -300KJ mol^?1

Explanation

To determine the heat of combustion of ethanol, we first need to find the amount of heat released by burning 0.92g of ethanol, and then convert that to kJ/mol.

First, we can find the amount of heat released using the formula:

\(\Delta Q = mc\Delta T\)

Where \(\Delta Q\) is the heat released, \(m\) is the mass of water, \(c\) is the specific heat capacity of water, and \(\Delta T\) is the change in temperature.

Using the given values: \(m = 100g\), \(c = 4.2 Jg^{-1}K^{-1}\), and \(\Delta T = 312.3K - 298K = 14.3K\), we can calculate the heat released:

\(\Delta Q = (100g)(4.2 Jg^{-1}K^{-1})(14.3K) = 6006 J\)

Now we need to determine the number of moles of ethanol in 0.92g. The molecular formula of ethanol is \(C_2H_5OH\), so its molar mass is:

\(2(C) + 6(H) + 1(O) + 1(H) = 2(12) + 6(1) + 16 + 1 = 46 g/mol\)

To find the number of moles, we divide the mass by the molar mass:

\(0.92g / 46 g/mol = 0.02 mol\)

Finally, we can find the heat of combustion per mole of ethanol by dividing the heat released by the number of moles:

\(\frac{6006 J}{0.02 mol} = 300300 J/mol \approx 300 KJ/mol\)

Since the heat of combustion is exothermic, the value should be negative. Therefore, the correct answer is:

Option C: -300KJ mol\(^{-1}\)

Correct Answer: D. produce inadequate food

Correct Answer: A. output per man-hour

Explanation

Labor productivity measures the hourly output of a country's economy

Correct Answer: C. Should Ado's sister come with us tomorrow?

Correct Answer: C. His people would not listen to him

Explanation

(I). The President is the Chief Executive of the country who performed the day to day administration of the country.

(ii). He inaugurated the National Assembly at the beginning of each session.

(iii). He assented to bills passed by the National Assembly into laws.

(iv). He appointed key officers e.g. ministers, ambassadors, the CBN Governor, Director of government agencies among others.

(v). He represented the country at international conferences like UNO, AU, Commonwealth, ECOWAS, etc.

(vi) He was the Commander-in-Chief of the Armed Forces.

(vii). He performed ceremonial functions

(viii). He exercised prerogative of mercy: He pardoned convicted persons or those found guilty of treasons.

(ix). He signed treaties with other countries on behalf of the country.

(x). He formulated policies for good governance.

(xi). He prepared and presented annual budget to the National Assembly for approval

(xii). He was empowered to declare a state of emergency/maintenance of law and order.

(xiii). He presides over executive council.

(xiv). He received ambassadors from other countries/ He maintained external relations with other countries.

(xv). He could declare war subject to the approval of the National Assembly.

(xvi). Declare National Assembly close i.e. prorogue