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The LD50 of aspirin is 1.1 g/kg for rats. Assuming the same LD50 for humans, what dose of aspirin would be required to kill 50% of people who weigh 130 pounds? Hint: 1.0 kg = 2.2 lb (inexact)
The name LD50 is an abbreviation for LethalDose, 50% or median lethal dose. It is the amount of the substance required (usually per body weight) to kill 50% of the...
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Why does an endotherm’s metabolic rate increase above the upper lethal temperature? And why does the metabolic rate fall below the lower lethal temperature?
Above the upper lethal temperature, an endotherm’s metabolic rate increases to expend energy that will be used to lose heat. As a result, increased metabolic rate causes sweating that stimulates...
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Calculate the molarity of an iron (ll) cyanide solution where 3.7 grams of Iron (II) Cyanide are dissolved in a total volume of 2 L of water.
We can find molarity by relating the number of moles of iron (ii) cyanide in 2L to 1L volume. Since molarity is simply number of moles in 1000ml or 1L.Number...
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A student wants to prepare 250 mL of a 0.035 mol L-1 solution from the primary standard, anhydrous sodium carbonate. Calculate the mass of anhydrous sodium carbonate that is needed.
n(Na2CO3) = C(Na2CO3) × V(Na2CO3) = 0.035 mol L-1 × 0.25 L = 0.00875 mol.m(Na2CO3) = n(Na2CO3) × M(Na2CO3) = 0.00875 mol × (2×23 + 12 + 3×16) = 0.9275...
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Which compound has the fastest rate of reaction with potassium cyanide to form pentanenitrile?
1-bromobutane
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How many mililiter of alcohol tert butil are needed to prepare 0.035 moles of chloride tert butil
tert-Butyl alcohol, also called tert-butanol or t- butanol, is the simplest tertiary ... 5.742×10−5 cm3/mol ... It is a chemical intermediate used to produce methyl tert-butyl ether (MTBE)
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Tracy is receiving lanoxin every 8.0 hours. She weighs 69 kg. The dose range for this drug is 0.030 to 0.060 mg/kg every day. What is the maximum safe dose (in mg) you could deliver every 8.0 hours?
Drug requirement for Tracy: 0.060 x 69 = 4.14 mg per dayMaximumsafe dose for each 8.0 hours is 4.14/3 = 1.38 mg
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Potassium bromide reacts with chlorine to produce potassium chloride and bromine. How Many grams of bromine are produced when 15.0 g of potassium bromide are used?
Solution:The balanced chemical equation:2KBr + Cl2 → 2KCl + Br2According to the equation above: n(Br2) = n(KBr)/2Moles of KBr = Mass of KBr / Molar mass of KBrThe molar mass of...
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(a) How many liters of wine can be held in a barrel with a 45 gal capacity? (b) The recommended adult dose of a drug is 17 mg/kg of body mass. Calculate the dose in mg for a 140 lb person.
(a) The imperial (UK) gallon is officially defined as 4.54609 litres. Then, a barrel with a 45gal capacity contains 45 x 4.54609 = 204.6 litres. (b) The imperial (avoirdupois, or...
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How many liters of water needs to be added to 7.00 g of Magnesium Cyanide to make a 0.500 solution of Magnesium Cyanide
500.00g - 7g = 493gD(H2O)=1, V(H2O)=493L
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