Density Practice Problems

[@TheOrganicChemistryTutor]

Final Exams and Video Playlists: www.video-tutor.net/

[@georgeallenher]

For problem #2, 3950g is correct, however the question was asking for it in kg. The proper dimensional analysis conversion is to take the 3950g, and multiply it by (1g/10^3kg)=3.95kg. If you look at the metric unit factor amount of kilo, you will see that kilo means 10^3. So you grab the initial amount, multiply it by 1g to cancel out the grams in the initial amount, then divide it by kilo 10^3 which amounts to 3.95kg. I hope this helps!

[@saivirupa9036]

the unit is 1kg/1000g, grams on the bottom to cancel out from 3950g

[@sciencework]

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[@christinerain6320]

same thing i was about to say,thx

[@dokcess]

Yeahh, if the mass is suppose to be in kg then after getting 3,950g convert to kg and that will be 3.95kg.

[@davinky1229]

Thank you!

[@chrisvu5319]

since I'm basically relearning all this with your help...I'll watch through your ads..

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[@robinlaunsby5000]

In your answer to #2 you give it in grams, however, your question states kilograms

[@dexterlaboratory8979]

Yes it must convert into kg, right?

[@DoggedGrim]

@@dexterlaboratory8979 yes. so the right answer to that would be 3.95kg not 3950g.

[@tiannah7049]

Yupp

[@joeblanco1434]

actually the answer is 3,950,000Kg

[@luisbolanos8393]

@@joeblanco1434 I think its 3.95 kg

[@yasirtaher0919]

100% the best explanation yet

[@ViNncentSmith]

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[@Fact-Trove40]

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[@georgesadler7830]

Professor Organic Chemistry Tutor, thank you for a solid analysis of Density Practice Problems in AP/General Chemistry. The practice problems/examples really show how to calculate Density using the given formula. Thanks to viewers for finding and correcting the small error in problem number two. The final solution to problem number two should be in terms of Kilograms not Grams.

[@devilsob5029]

thank you for the tutorial! my math teacher doesn't know how to use teams that well so I'm glad I can always come here when I don't understand :-)

[@akumajinzu9451]

2:04 For anyone wondering how to convert g to kg, simply divide the answer by 1000 and if you want to convert it back to kg, just multiply 1000. That's why many people says the answer of number two should've been 3.95kg

[@kevenjimenez4354]

Haven't studied a lick of content for my exam later today, and here I am

[@ma.carmeladelfino3296]

Answer for question #2 is correct which is 3,950grams. However, the problem is asking for its mass in kg so you have to convert it for you to get the mass in kg. So, answer will be 3.95kg

[@captauron4514]

09:11 shouldn't your sig figs be just two? 25g rock is two sig figs so should your answer be 8.1 g/mL instead?

[@NicoleDemetria]

Yeah same for the first question, there’s only 2 sig figs in 50 g and 8.5 mL so the answer should be 5.9 g/mL.

[@surya.kasibhatla]

most tutorials don't follow sig figs

[@nickyecen]

2:01 The question asks for the mass in Kg, so the answer is actually 3,95 Kg

[@boaaintnowayboa3002]

no comma needed, just 395 kg!

[@surya.kasibhatla]

@@boaaintnowayboa3002 3.95 not 395

[@kyragale3384]

It's not a comma though, its in decimal point​@@boaaintnowayboa3002

[@sherlynrosas1218]

Thank you so much you got me ready for my test tommorow. Wish me luck

[@aestheticwithaiman9969]

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Thanks!

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How did you do in the test?

[@kristinam9603]

Fuel tank holds 22.3 gallons of gasoline. Density of gasoline is 0.8206 g/mL, what is the mass in kg of gasoline in a full tank? (I can’t seem to figure it out. We are looking for mass, so multiple D and V to get 18.298380 mL and I divided by 1000 mL since 1 kg = 1000 mL, so I got 0.0183 kg as I rounded) I have a problem I’m stuck on. I’ve watched your videos, but when I try to do it myself, I can’t seem to get the right answer!

[@cristianbadua6945]

I think the final answer in no. 2 is converted into kg?

[@divyoroy9056]

yea but you can convert it though 1000 g=1kg so to find it in kg just multiply by 1000

[@faizk4220]

@@divyoroy9056 but hes saying that the video creator got the answer wrong because of that

[@Elizabethamoateng]

In the first question you didn't change from g to kg

[@ruthiemellows8354]

isn't it the second question?

[@godsonmontell]

@@ruthiemellows8354 yh

[@SB-jf7sw]

I pls need an answer, why is the first example, =5.88 g/ml | the ml why isn’t it cubed???

[@surya.kasibhatla]

1 cm^3 = 1 mL , no need to cube mL

[@heidiwetterstrom8472]

If a piece of rock has a volume of .73 L and a mass of 1524 g what is the density of the rock in g/mL. So its 1524g/.72 L which is 2087.67. So how would I write the answer? Dont I have to do something with the decimal point?

[@ChemSimplified]

Heidi Wetterstrom This is a little late, but here goes. Since the question asks for density in g/mL, the answer will be 1524g/730mL = 2.1 g/mL. When dividing, you round off the final answer following the least significant figure, which in this case is 2 sig fig (based on 730 mL).

[@Traitors1991]

It's been a long time since I've done these types of problems. Thank you.

[@remikinoshi833]

U guys deserve a Grammy award.

[@safiyya4238]

Thanks so much for this video. You've shown all kinds of problems, which was really useful.

[@lak486]

I'm confused on how your answer for the first problem is 5.88g/mL? that answer has 3 significant figures yet the most in the problem is 2 and the limiting is 1 significant figure is it not?

[@ChemSimplified]

Lakoda Hindahl Yes. The answer wasn't presented in the correct sig fig. Otherwise, it would be 6 g/mL.

[@NicoleDemetria]

@@ChemSimplified wouldn’t it be 5.9 g/mL? The 8 rounds the other 8 to a 9.

[@surya.kasibhatla]

most tutorials dont do sig figs

[@vanessasamarani8859]

The second question states the answer to be given in kg but you did not convert it, it would’ve been 3.95kg. Anyways thanks for all your help, I really love your channel. :)

[@sheharyarmazhar9423]

You were very helpful for my exams for 3 years in a row i thank you from the bottom of my heart. I could not have aced without you thank you for your hardwork.I have a question: Density=Mass/volume so if we convert this to its symbols p=m/v but in your questions you have written d instead of p (which stands for rho) id like you to explain this.

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[@kabouch]

2:01 the answer to problem 2 has to be given in the kilogram unit; therefore, the answer should be 3.95kg, shouldn't it?

[@0xtommaso]

For #3, isn't the answer actually .00926kg/m^3 because 1000g = 1kg? Thanks!

[@kitkat-rd7eb]

Is it possible to find the height of a cylinder only given the density and radius? I wasn't provided the mass in my problem and I have no idea what to do

[@MeliStephanie]

What is the program that you used to do that video?

[@hfbkjbveevnek.v7792]

Howd u get 500 ml i the first problem

[@rhodgerkuluwunde7144]

Thanks so much you teach better than my teacher

[@rox.x035]

Thank you very much it helped me more than my 8th grade teacher did

[@wolvzz-_-8324]

1:58 your supposed to put it in kg

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i was forced to come here

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lol

[@thatonepersonoo3124]

I came here from a link my teacher gave me in edmodo lol

[@doven6109]

🤣

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Thanks the way you explain is extremely good

[@aidanlee169]

This is the number of people who didn't fail a test because of this video. ⬇

[@deltacode8576]

Isn't it necessary to come up with the answers in its significant figures?

[@choochoo7443]

Is it 3.95kg per 500 mL for question #2?

[@quickfood5860]

if you have a mass of granite 15.6g "suspended" can a mass of 5.5g of water displacement finding the density

[@gratiajugan524]

Thank you so much you are a great teacher

[@TheOrganicChemistryTutor]

You're welcome

[@denisedixon1335]

Your answer for #2 is wrong. The question asks for KILOGRAMS NOT GRAMS. The answer is 3.95 kg NOT 3950 grams.

[@quickfood5860]

i want to ask a question can you solve it sir

[@mrzzatvlogger6526]

it can be solve in gram? why you not change gram to kg first? this is confusing me bcoz my lecturer said that must change the SI unit first? please explain. huhu.

[@willm3027]

No sig figs?

[@larinamiaron2442]

Water in a beaker measures 250 mL. A rock is completely submerged in the water. The water level now reads 350 mL. What is the volume of the rock in cubic centimeters?

[@k_intra]

10 cm^3

[@lunawenghiraeth5133]

What is the density (in g/L) of a gas with a mass of 60 g/mol at 0.75 atm and 27 ⁰C? Help🥲🥲🥲

[@davetoth9767]

Your videos are really well done. Thanks so much.

[@ivosuper]

and the conclusion is mass is a product of density and volume :)

[@leistungsolutions2820]

I was so happy to understand

[@jaedyn8678]

Ive been given a density question, and the question reads, "A small sphere of unknow density is dubmerged in a beaker of water and let go. Immediately after being let go the sphere accelerates down at 1.70 m/s2. What is the density of the sphere? (d(water)= 1000kgm-3, g=9.81ms-2) Like WHAT, any help LOL

[@adminspiderman5378]

If you have the answer can you tell it to me?

[@jaedyn8678]

@@adminspiderman5378 this was first semester cuz, long gone past this paper

[@braedenbritton5688]

That was really helpful btw I got all correct

[@efraimmaru3506]

what is the full answer about that topic because i cant understand your calculatio n:>

[@marlosabandal3983]

in question #2...3.95kg? or still 3950g?

[@sandipanganguly2219]

I want to say the density of water is around 900 to 990, the rock in question #4 is 8.06g/ml , that should float in water, so how it sank

[@vanshsharma647]

Hear, Density = Mass/Volume and Mass = Density*Volume here we don't know the density? please tell.

[@gavrielchasky8943]

Your sig figs are off and number 2 you did not convert back into kg you just left it in g

[@ChichiMarie]

Gavriel Chasky I caught that too. Comment sections helps me make sure I’m not crazy lol

[@mistyb4987]

What would your answer for number 2 be? Asking for a friend.

[@ffdleconte2842]

i guess you have to convert it to get your answer in Kg

[@tdofeldt5742]

its supposed to be 3.950 right?

[@tdofeldt5742]

kilos

[@roitorcino7076]

Please simplify it to the least significant figures

[@wezzle8287]

great video thanks Amazing explanation :)

[@cherylfebrero9602]

When I solved 4/3π(2.5)³ it equals to 65.44 ?

[@uachannel4133]

Thank you so much, your are one of my teacher.

[@bigbalaz8650]

awesome vid helped me with my exam.

[@lidyateshome1840]

On the second question you forgot to change the mass in kilogram its okay tho we are all humans after all but the real answer is 3.95Kg. thanks for the video it helped a lot i swear! Blessed.

[@surya.kasibhatla]

yeah

[@layzymarky7351]

In question number 2, isn't it you need to convert g into kg.

[@JustinMorgan105kg]

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[@ivetterice246]

To me, he kind of sounds like eminem. :-)

[@just1n1an1]

For question number 2 dosnt that break down to 3.95kg/500mL? And then do you break that down one more time into .0079 kg/ml?

[@rachelerickson347]

Thank you

[@likeand_laugh]

covert it to Kg @1:59

[@rexraptor1094]

Anyone here because of their chemistry professor not doing a very good job at explaining this concept?

[@Deckstah02]

I think the answer is 3.95kg🙏

[@spicytea6901]

All is great but I am utterly lost on the one where you use Pi 😭

[@the12hourfamilygang94]

Same

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You are a life saverrrr!!!

[@rodcliffestephens]

Keep up the good work.

[@rosemendoza9552]

Very helpful thank you so much

[@carrotshvikpious3636]

Why didn't you use significant figures?

[@gmsgaming5550]

video is very helpful but can you please explain too

[@aliasatfhell4074]

i am looking at my notes my teacher has p=m^v but like is the same density=mass ^ volume but in the example quesion: a metal alloy is made from a mixture of 300g of copperand 200g of zinc the density of copper is 8900kgm-3 and the density if zinc is 7140kgm.find the density of the alloy his answer : mass of copper=300g =0.3kg mass of zinc =200g=0.2 total mass of alloy=5kg vol of copper =0.3 divide {^) 8900= do the math in sintificaleltor vol of zinc=0.2^7140= ... he added them answers 0.5 divide ^ 0.0000617191L=8101kgm ???idk how he did this i not sure how he did this but it feels wrong,it physics by the way but he teaches math, chem and phys plus he is the principal i have to move schools cuz my guy really have all teacher slack off and hiself plusw they miss a hella classes i went to private schools all my life but this one crushed me anyway i,lll like to find out the misstakes in the question and i,ll like to get the answers thx

[@CoolGuy-gb1qe]

In question #2, the answer must be given in grams, doing some unit conversion, 3950g/1000g gives you 3.95 Kg

[@minemanyt419]

The Organic Chemstry Tutor: This chemistry video tutorial explains how to solve density problems. It provides all of the formulas and equations you need such as finding the volume of a sphere or the volume of a rectangular prism. It even covers dimensional analysis and unit conversion density problems where you may have to convert g/mL to Kg/m^3. This video contains plenty of examples and practice problems including water displacement method density problems. *zoom in* **This chemistry video tutorial** but this is physics ;-;

[@immyself.4393]

when im searching math subjects his vid s are coming, the same thing happens with chemstry and physics

[@rachelo9oooyohannes254]

For question # 2 why is the answer in grams not in Kg? I am a bit confused🙄

[@surya.kasibhatla]

he forgot lol

[@angelasaddul9204]

Another more pls i iam 4thgrade need more dont wanna fail in science!

[@noahburton1297]

You won't be doing this science for a while hopefully lol

[@dominoscustomersupport4373]

I don't know how you got here but don't worry, this is chemistry. You won't need to know this yet. Just keep practicing your multiplacation times tables because you will need them for perimeter and area, harder fractions and even harder math problems. 4th grade is important so try your best because ( if you're in New York like I am) you will have to do the science state test and if you're not then 4th grade is getting harder since it is preparing you for middle school. Btw my little brother is in 4th grade too, so I know what I'm talking about

[@dumbman5948]

my man used a circle shape instead of a diamond shape

[@internalinjectiontrulyhere6182]

Stress has it aim at signaled false density

[@ilovegarfield22]

Yo is this to oeasy for 7th grade?

[@MusicMind220]

Am I the only one who’s watching this due to you forgetting how to do it and you have a test tommorow?

[@ibrahimbinmohammedshaheel5104]

Thanks very good explanation! It will help me in the science exam lol 😆

[@canaveral8369]

ok thanks!

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thank you so much 🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼

[@sebastiansebastian7671]

many thanks to you sir ily