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Chemistry
zarkam21:

covalent compound CCl4?

5 months ago
zarkam21:

Carbon tetrachloride?

5 months ago
Vocaloid:

yup

5 months ago
zarkam21:

compound N2O5?

5 months ago
zarkam21:

DInitride pentoxide??

5 months ago
Vocaloid:

good

5 months ago
zarkam21:

incorrect? :S

5 months ago
Vocaloid:

oh sorry, when you have two nonmetals, for the first element gets its full name spelled out, not the -ide suffix dinitrogen, not dinitride :S

5 months ago
zarkam21:

and the second?

5 months ago
Vocaloid:

keeps the -ide suffix, so pentoxide

5 months ago
zarkam21:

What is the name for the compound N2O4?

5 months ago
zarkam21:

Dinitrogen tetraoxide??

5 months ago
Vocaloid:

almost, tetra + oxide ---> tetroxide (it drops the a)

5 months ago
zarkam21:

formula P2S5.

5 months ago
zarkam21:

Pentaphosphorus disulfide

5 months ago
Vocaloid:

almost, just switch the prefixes (2 phosphorus atoms, 5 sulfur atoms)

5 months ago
zarkam21:

but dont you have to switch

5 months ago
zarkam21:

like would phosphorus have 5

5 months ago
Vocaloid:

hm? Pentaphosphorus disulfide would be P5S2 not P2S5

5 months ago
zarkam21:

yeah but to make it neutral dont you swtich

5 months ago
Vocaloid:

you're thinking of charges, the compound is already neutral so don't worry about charges here

5 months ago
zarkam21:

oh okay

5 months ago
zarkam21:

A flask contains 0.500 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.

5 months ago
zarkam21:

2.41 x 10^24

5 months ago
Vocaloid:

hm not quite 0.500 mol of Br2 molecules --> each molecule has 2 Br atoms, so ---> 1 mol of Br atoms --> avogadro's number of br atoms

5 months ago
zarkam21:

79.91*6.022 x 10^23

5 months ago
Vocaloid:

79.91? no, it's just avogadro's number, the molar mass of the element is irrelevant here

5 months ago
zarkam21:

6.022 x 10^23

5 months ago
Vocaloid:

ugh wait it asks for bromine molecules not bromine atoms >_> so just half of avogadro's number i gotta read these more carefully

5 months ago
zarkam21:

1.2044 x 10^24

5 months ago
Vocaloid:

(6.022 x 10^23)/2 = 3.011×10^23

5 months ago
zarkam21:

wait whee are you getting two from

5 months ago
Vocaloid:

0.500 mol of Br2 molecules, or in other words, half a mole half a mole = avogadro's number/2

5 months ago
zarkam21:

the 2 signifies the half?

5 months ago
Vocaloid:

yes. dividing something by 2 is equivalent to taking half.

5 months ago
zarkam21:

The fuel used in many disposable lighters is liquid butane, C4H10. How many carbon atoms are in 2.00 g of butane?

5 months ago
zarkam21:

Last one

5 months ago
zarkam21:

then im gonna go to sleep;.getting tired

5 months ago
Vocaloid:

first step: g of butane to moles butane --> divide 2.00/molar mass of butane second step: moles of butane to moles of carbon. 1 molecule of C4H10 has 4 carbon atoms according to its formula so multiply step 1 result by 4 third step: moles of carbon to atoms of carbon, so multiply the previous result by 6.022e23

5 months ago
Vocaloid:

to save some time: molar mass of butane = 58.12 so (2.00/58.12) * 4 * 6.022e23

5 months ago
zarkam21:

8.29 x 10^22

5 months ago
Vocaloid:

good

5 months ago
zarkam21:

Calculate the mass of 1.00×1024 (a septillion) molecules of water

5 months ago
zarkam21:

This is the last one

5 months ago
zarkam21:

10^24

5 months ago
zarkam21:

but it would just be 1.00 x 10^ 24 times molar mass?

5 months ago
photonics:

you need to convert the quantity to moles first

5 months ago
zarkam21:

avagadros?

5 months ago
Vocaloid:

atoms ---> moles divide by avogadro's

5 months ago
photonics:

ye divide by avocado's

5 months ago
Vocaloid:

|dw:1539584128678:dw|

5 months ago
zarkam21:

1.66

5 months ago
photonics:

1.66 what?

5 months ago
zarkam21:

um moles

5 months ago
photonics:

yup. so now multiply by molar mass to get grams

5 months ago
zarkam21:

wiat times 1.00 x 10^24?

5 months ago
Vocaloid:

nah, you just calculated 1.66 moles so multiply that by the molar mass to get g

5 months ago
zarkam21:

molar mass so ?

5 months ago
zarkam21:

the same number given?

5 months ago
Vocaloid:

the compound given in the question is water, so you need to multiply 1.66 moles * the molar mass of water.

5 months ago
zarkam21:

29.9

5 months ago
Vocaloid:

yeah that's what i got too

5 months ago
zarkam21:

is sig figs right

5 months ago
Vocaloid:

yeah they gave you 3 sig figs so the result also has 3 sig figs

5 months ago
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