How many litres of water must be evaporated away from a 10% strength salt solution to produce 30L of a 20% strength salt solution? Round your final answer to 2 decimal places if necessary.

Q: D) After the drug reaches its maximum concentration, how many hours are required for the…

A: Given the graph of a concentration of a drug in bloodstream(in mg/L) versus tine time (in hours)…

Q: John wants to make 100 ml of a 5% alcohol solution by mixing a 2% alcohol solution with a 7% alcohol…

A:

Q: The half-life of radioactive radium (226Ra) is 1599 years. What percent of a present amount of…

A: Equation governing the radioactive decay is: A = A0e-kt When t = 1,599 then A = A0 / 2 (this is by…

Q: The hat-ite of carbon-14 is 5730 years. How long does it take for 24 grams of carbon-14 to be…

A: The half-life of carbon 14 is 5730 years.It take for 2.4grams reduced to 1.7 grams.

Q: Recall the formula for calculating the magnitude of an earthquake, M=2/3log(S/S0).  . One earthquake…

A: Magnitude of an earthquake , M=23log SSuMagnitude of first earthquake=3.923log SSo=3.9 -1

Q: The half-life of silicon-32 is 710 years. If 60 grams is present now, how much will be present in…

A: Since we have the radioactive decay formula:                         A=A0.2-th      where  A =…

Q: In a certain culture of bacteria, the number of bacteria increased sixfold in 10 h. How long did it…

A:

Q: How much carbon dioxide emissions will youcause by using your 250 watt laptop for 3 hours? Express…

A:

Q: You have 128 grams of a radioactive kind of strontium. If its half-life is 51 days, how much will be…

A: ln e= 1 ln ab=b ln a

Q: How long will it take 700 milligrams of silicon-31 to decay into 400 milligrams? (Round your answer…

A:

Q: How many liters each of a 15% acid solution and a 60% acid solution must be used to produce 90…

A: Given  15% acid solution and a 60% acid solution must be used to produce 90 liters

Q: If 8 g of a radioactive substance are present initially and 4yr later only 4.0g​ remain, how much of…

A: Initially 8 gm is present. After 4 yrs, 4 hm remained. To calculate after 9 yrs.

Q: The amount of water required for a yard which has been landscaped for a desert environment is 17% of…

A: The value of x% of y is calculated using the formula below.

Q: A chemical substance has a half-life of 5 hours.how much of a 82-gram sample remains after 12 hours?…

A:

Q: A factory produces bicycles at a rate of 95 + 300t? – 10t bicycles per week (t in weeks). How many…

A:

Q: A chemist needs to strengthen a 32% alcohol solution with a 50% solution to obtain a 41% solution.…

A: chemist needs to strengthen a 32% alcohol solution with a 50% solution to obtain a 41% solution. We…

Q: how many nanoseconds does it take light to travel 5.50 ft. in vacuum? (this result is a useful…

A: Light travels on 5.50 ft in vaccum

Q: The​ half-life of​ silicon-32 is 710 years. If 40 grams is present​ now, how much will be present in…

A:

Q: Assume you are to take a 500 mg pill every 4 hrs for a week. Instead, you take it every 3hrs. By how…

A:

Q: Miss Frizzle and her students noticed that a particular bacterial culture started off with 356 cells…

A:

Q: A hose fills 2/8 of a pool in 3/6 of an hour. At this rate, how much of the pool will these hose…

A: given that  A hose fills 2/8 of a pool in 3/6 of an hour. Clearly 1/4 of a pool filled in 1/2 hour…

Q: The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be…

A: For the solution follow the next step.

Q: A pot contains 6 L of brine at a concentration of 120 g/L. How much of the water should be boiled…

A: Given, A pot contains 6 L of brine at a concentration of 120 g/L.

Q: You invest in an account paying 10% compounded monthly. How long will it take for you to double your…

A:

Q: If gas prices in New York are $3.16/gallon, and your car gets 32 miles/gallon, then how much does it…

A: Since the gas prices in New York are $3.16/gallon and our car gets32 miles/gallon, Then Our Aim is…

Q: In a certain culture of bacteria, the number of bacteria increased sixfold in 10h. How long did it…

A:

Q: Two of the most devastating earthquakes in the San Francisco Bay area occured in 1906 along the San…

A: Let the intencity of earthquake in the San Francisco Bay area occurred in 1906 be I1  Let the…

Q: The bacteria in a 4-liter container double every minute.After 60 minutes the container is full. How…

A: The bacteria get double every minute;                             After…

Q: In a nuclear power plant, a 1.0 kg of water at 74.5 °C is converted into 1.0 kg of steam at 115 °C.…

A:

Q: How long will it take 200,000 to increase by 80,000 if invested at 8% converted annually

A: Here in the given question:   Principal amount P = 80,000   Final amount (A) = 2,00,000   Interest…

Q: The half-life of radioactive radium (226Ra) is 1599 years. What percent of a present amount of…

A: Given      Hlaf life of radioactive radium is 1599 year .    ⇒ t12=1599Period of time ,t=525 years…

Q: The ratio of carbon-14 to carbon-12 in a piece of wood discovered in a cave is  R = 1/817.…

A: The carbon model is given by R=11012·e-t8223           ................[1] Given that:R=1817 put in…

Q: The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be…

A: Given initial mass   m=175 gram

Q: How many liters each of a 25%25% acid solution and a 75%75% acid solution must be used to produce…

A: 25% acid solution and 75% acid solution is mixing to get 70 liters 50% acid solution. We want to…

Q: A bleach disinfecting solution is mixed at a 3:5 ratio (bleach to water). If the solution has 750 mL…

A:

Q: The ratio of carbon-14 to carbon-12 in a piece of wood discovered in a cave is  R = 1/916.  Estimate…

A: Given the data

Q: A chemical substance has a half-life of 5 hours.How much of a 107-gram sample remains after 12…

A: In this question we have to find sample remain after 12 hour. Formula used N=N0*(1/2)^t/t1/2

Q: A truct gets 800/x miles per gallon (mpg) when driven at a constant speed of x mph where 40 <=…

A:

Q: One mole of gas expands isothermically to double its volume. If the gas temperature is 300 K, what…

A: One mole  n=1 T=300K R=8.3

Q: A chemist needs to strengthen a 32% alcohol solution with a 55% solution to obtain a 40% solution.…

A: Given, A chemist needs to strengthen a 32% alcohol solution with a 55% solution to obtain a 40%…

Q: How many times more intense is an earthquake measuring 6.8 on the Richter scale than one measuring…

A: Answer: 15.84

Q: How many times more intense is an earthquake of magnitude 8.2 than an earthquake of magnitude 7.5?

A:

Q: If the population of a certain county was 100,000 in 1998 and 110,597 in 2008 and the formula…

A: We know that the exponential growth is a process of increase in a quantity with time. The population…

Q: How many liters of pure water should be mixed with a 4​-L solution of 60​% acid to produce a mixture…

A: Let x be a liter of water to add to produce a solution that is 80% water Therefore, 40%4=401004=1.6…

Q: A water hose had filled up of a pool after this rate, how many hours would it take to fill the pool?…

A: Given that  1/7 pool is to be filled in 1/10 hour To find total hours to fill the pool

Q: The​ half-life of​ silicon-32 is 710 years. If 40 grams is present​ now, how much will be present in…

A:

Q: The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be…

A: initial mass=135 grams half-lives=4

Q: If the population of a certain county was 100,000 in 1998 and 110,693 in 2008 and the formula y =…

A: Given Population of country in year 1998 is 100,000 and Population of country in year 2008 is…

Q: a cup of coffee has 95mg of caffeine. the amount of caffine in your body diminishes by 7% each hour.…

A:

Q: A pot contains 5 L of brine at a concentration of 80 g/L. How much of the water should be boiled off…

A: Let x = liters of water to be boiled off.

Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.