# chemistry

A sample of CH2F2 with a mass of 19g contains _________ atoms of F

CH2F2= 52.03
x = grams of F

x/19 = 38/52.03
x= 13.88 grams

13.88/38 = 0.365 moles
0.365*6.02x10^23 = 2.2x10^23
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
But it tells me that that answer is wrong so what did I not do correctly, and what does that make the answer?

1. 👍
2. 👎
3. 👁
1. What proportion of the molecule is F?

2*19/(12+2+2(19))=38/52 rounded atomic numbers.
so F is 13 grams (about) as you did.

Now , that is how many moles of F?

1. 👍
2. 👎
👤
bobpursley
2. Ah, Thanks!

1. 👍
2. 👎

## Similar Questions

1. ### Chemistry

A sample of propane,C3H8, contains 14.4 moles of carbon atoms. How many total moles of atoms does the sample contain?

2. ### Math

A gas station charges \$2.19 per gallon of gas. Use the function notation to describe the relationship between the total cost C(g) and the number of gallons purchased g. A. C(g) = -2.19g B. g = 2.19C(g) C. C(g) = g + 2.19 D. C(g) =

3. ### chemistry

a sample of glucose, c6h12o6 contains 2.03*10^21 atoms of carbon. (a)how many atoms of hydrogen does it contain? (b)how many molecules of glucose does it contain? (c)how many moles of glucose does it contain? (d)what is the mass

4. ### science

Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property

1. ### chemistry

A sample of propane C3H8 contains 13.5 moles of carbon atoms how many total moles of atoms does the sample contain?

2. ### Chemistry

Perpare 500ml of 1M HCl solution from a bottle of concentrated 37%(W/W) HCL stock with a density of 1.19g/ml. 37%= 37/100 x 100 therefore mass is 37g molarity = mol/vol 1= mol/0.5 mol=0.5 mass of Hcl needed = molxmr mass = 0.5 x

3. ### Physics

A sealed container of volume 0.10 m3 holds a sample of 3.0 x 10^24 atoms of helium gas in equilibrium. The distribution of speeds of helium atoms shows a peak at 1100 ms-1. Caluculate the temperature and pressure of the helium

4. ### chemistry

what is the mass in grams? a) 3.011 x 10^23 atoms F b)1.50 x 10^23 atoms Mg c)4.50 x 10^12 atoms Cl d)8.42 x 10^18 atoms Br e) 25 atoms w f) 1 atom Au can you please explain a and b to me then i'll come back later and see if i did

1. ### Chemistry

Suppose that a device is using a 5.00-mg sample of silicon that is doped with 1 × 10-5% (by mass) phosphorus. How many phosphorus atoms are in the sample?

2. ### chemistry

A sample of propane(c3h8)has 3.84x10^24 H atoms. a) how many carbon atoms does the sample contain? b) what is the total mass of the sample?

3. ### Chemistry

Caffeine a stimulant found in coffee has the mass composition of C, 49.48%, H, 5.19%, N, 28.85%, O 16.48%. The molar mass of caffeine is 194.19g/mol. Find the molecular formula for caffeine.

4. ### ap chemistry

Discuss briefly the relationship between the dipole moment of a molecule and the polar character of the bonds within it. WIth this as a basis, account for the difference between the dipole moments of CH2F2 and CF4. does anyone