Answer:
0.0250 g
Explanation:
Step 1: Determine the molar mass of Vitamin C.
The molar mass is the mass in grams corresponding to 1 mole. In order to calculate the molar mass of vitamin C (C₆H₈O₆) we need to add the molar masses of the elements that compose it.
M(C₆H₈O₆) = 6 × M(C) + 8 × M(H) + 6 × M(O)
M(C₆H₈O₆) = 6 × 12.01 g/mol + 8 × 1.01 g/mol + 6 × 16.00 g/mol
M(C₆H₈O₆) = 176.14 g/mol
Step 2: Calculate the mass corresponding to 0.000142 mol of vitamin C.
(a) Power of bulb is 100 W, converting this into kW.
Thus,
The bulb is used for 6 hours per day for a year, in 1 year there are 365 days thus, total hours will be:
Electricity used will depend on power and number of hours as follows:
The cost of electricity is $0.15 per kW.h thus, cost of electricity for 219 kW.h will be:
Therefore, annual cost of incandescent light bulb is
(b) Power of bulb is 25 W, converting this into kW.
Thus,
The bulb is used for 6 hours per day for a year, in 1 year there are 365 days thus, total hours will be:
Electricity used will depend on power and number of hours as follows:
The cost of electricity is $0.15 per kW.h thus, cost of electricity for 54.75 kW.h will be:
Therefore, annual cost of fluorescent bulb is .