# Intro to Chemistry

A substance X has the density of 0.359 g/mL at room temperature. What is the volume in mL of 25.0 g of the substance? Show calculation.
--------------------------------------
I tried to cross multiply but I dunno...I'm getting some pretty crazy numbers. Any suggestions?

1. 👍 0
2. 👎 0
3. 👁 55
1. 25.0 grams (1 mL/ .359 grams) = 69.6 mL

1. 👍 0
2. 👎 0
posted by Damon
2. I am not a fan of "cross multiplication and make the following suggestion:

One by any other name is one, and if you multiply by one, you do not change the amount of whatever but only its name.

for example if there are 25 cows per 3 fields I write that as (25 cows/3 fields) and since that is the same top and bottom, I name that conversion factor one :)

Now if I have 15 fields, how many cows. Multiply by my conversion factor so the units I want to cancel will cancel

now if I have 75 cows:

75 cows * ( 3 fields / 25 cows ) = 9 fields

I multiplied by fields over cows so I canceled cows and ended up with fields.

Now if I had 12 fields and wanted to know how many cows I would do the inverse:

12 fields * (25 cows /3 fields) = 100 cows

This is particularly helpful if you have a long string of conversions to make at once. It does not matter how many times you multiply by something that is the same on the top and the bottom except for the name.

1. 👍 0
2. 👎 0
posted by Damon
3. Did you get 125 cows in 15 fields ? :)

1. 👍 0
2. 👎 0
posted by Damon
4. yes i did thanx!
the cross multiplying actually worked out pretty well! thank u so much!

1. 👍 0
2. 👎 0

## Similar Questions

1. ### chemistry

what is the density of a substance if a 2.50 ml sample has a mass of 0.880g at room temperature? what is the specific gravity of the substance?

asked by Sasha nelson on September 9, 2012
2. ### Science

I have two questions and I have answers for them and I don't know if there right or not. The ones that have stars by the answers is the answers I picked. 1. Complete this sentence. If volume remains the same while the mass of a

asked by Dan on August 22, 2017
3. ### Physics

The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius. - The 100 joules of heat is needed to completely change

asked by Joey on November 14, 2014
4. ### chemistry

B. Everyone knows that water is supposed to boil at 100° C. Why did your water sample boil at a different temperature? C. While heating two different samples of water at sealevel, one boils at 102o C and one boils at 99.2o C.

asked by emmanuel on September 16, 2011
5. ### Science

one of the properties of matter is density. density is defined as the mass per unit of volume of a substance. a substance that is more dense than another has more mass for the same volume than the other substance. Density of gases

asked by Immh on June 7, 2018
6. ### Chemistry

Substance A has a density of 4.0 g/mL and substance B has a density of 2.0 g/mL. If we have equal-mass samples of each, which has the greatest volume?

asked by Anna on January 23, 2011
7. ### Chemistry

Substance A has a density of 4.0 g/mL and substance B has a density of 2.0 g/mL. If we have equal-mass samples of each, which has the greatest volume?

asked by Anna on January 23, 2011
8. ### Chemistry

Your bedroom is 18 ft long and 15 ft wide, and the distance from floor to ceiling is 8 ft 6 in. You need to know the volume of the room in metric units for some scientific calculations. (a). What is the room’s volume in cubic

asked by Nicole on October 3, 2011
9. ### Physics

60) A class of 10 students taking an exam has a power output per student of about 200W. Assume the initial temperature of the room is 20 C and that its dimensions are 6.0 m by 15.0 m by 3.0 m. What is the temperature of the room

asked by Y0gi on November 30, 2010
10. ### Chemistry

3. A hypothesis is a testable statement.- T 4. Weight is a measure of the quantity of matter.- F 6. Potential energy is energy of motion.- F? 7. Liquids do not have a definite shape or volume.- F 8. The ability to burn is a

asked by mysterychicken on October 25, 2010

More Similar Questions