What is one example of boyles law
1 answer:
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(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 .
<u>Answer:</u> The mass of solid NaOH required is 80 g
<u>Explanation:</u>
Equivalent weight is calculated by dividing the molecular weight by n factor. The equation used is:
where,
n = acidity for bases = 1 (For NaOH)
Molar mass of NaOH = 40 g/mol
Putting values in above equation, we get:
Normality is defined as the umber of gram equivalents dissolved per liter of the solution.
Mathematically,
Or,
......(1)
We are given:
Given mass of NaOH = ?
Equivalent mass of NaOH = 40 g/eq
Volume of solution = 400 mL
Normality of solution = 5 eq/L
Putting values in equation 1, we get:
Hence, the mass of solid NaOH required is 80 g