plz answer both in detailed solution, tnx 1. while you are doing heavy work, you
ID: 2026277 • Letter: P
Question
plz answer both in detailed solution, tnx
1. while you are doing heavy work, your heart pumps up to 25.0 L of blood per minute. Your brain gets 3-4% by volume of your blood under these conditions. What volume of blood in liters is pumped through your brain in 125 minutes of work that causes your heart to pump 22.0 L per minute, 3.43% of which goes to your brain?
2. In chemical reactions that release energy, from 10-8 % to 10-7 % of the mass of the substances involved is converted into energy. Consider a chemical reaction for which 1.8 x 10-8 % of the mass is converted into energy. What mass in milligrams is converted into energy when 1.0 x 103 kilograms of substance reacts?
Explanation / Answer
1. First we have some information to confuse us. Then we have the real information. Time times volume per minute time percent = volume that goes to brain. 3.43% = 0.0343 125 minutes * 22.0L/min * 0.0343 = 94.325 L 2. To convert from percent to a number, we divide by 100. 1.8 x 10^-8% = 1.8 x 10^-10 1000 mg = 1 g 1000 g = 1 kg 1.0 x 10^3 kg = 1.0 x 10^9 mg 1.8 x 10^-10*1.0 x 10^9 mg = 0.18 mg 0.18 mg of the mass is converted to energy.
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