School and Work

After 110 minutes, 50% will be left.
After 220 minutes, 25% will be left.

However, you want it after 200 minutes. Because 25% is left after 220 minutes, after just 200 there will be a bit more than 25% left.

The only answer that fits this is 28%. It can't be 25% or less than 25%, and we already worked out that 50% would be left after just 110 minutes.

So the answer is A, 28%.

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the average weight of an adult is 70kg and average blood amount is 6l. Since blood has almost same density as water so weight of blood in average adult is 6kg.

so the % of blood in body weight =6/70 *100= 8.57%

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15 minutes is 0.25 hours
100W is 0.1 kW.
So the bulb CONSUMES (0.25 * 0.1) kWh = 0.025 kWh

If the bulb PRODUCES 0.0015kWh of light energy, the efficiency is equal to:

energy produced divided by energy consumed = 0.0015 / 0.025 = 0.06

expressed as a percentage this is = 6% efficient (not very good efficiency !)

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(88,347,000/3,389,269,000) x 100 = 2.6%

:)>

Sorry, I could not read the content fromt this page.

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Equation= Fe2O3 + 3 CO yields 2 Fe + 3 CO2.
Based on the equation, a certain amount of Fe2O3 reacted with excess CO gas yielding 185 grams of Fe. If the percentage yield is 84.9%, how many grams of Fe2O3 reacted?

*If you can help, please show your work, telling me where certain numbers or conversion factors came from! Appreciate it immensely, thanks!

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