Water consists of hydrogen and oxygen, and the approximate

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Water consists of hydrogen and oxygen, and the approximate [#permalink]

07 Dec 2012, 06:23

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Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of oxygen are there in 144 grams of water?

(A) 16
(B) 72
(C) 112
(D) 128
(E) 142

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Re: Water consists of hydrogen and oxygen, and the approximate [#permalink]

07 Dec 2012, 06:26

Walkabout wrote:

Since the ratio, by mass, of hydrogen to oxygen is 2:16, then oxygen is 16/(2+16)=8/9 of mass of water.

Therefore there are 144*8/9=128 grams of oxygen in 144 grams of water.

Answer: D.
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Manager

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Re: Water consists of hydrogen and oxygen, and the approximate [#permalink]

04 Jan 2013, 20:12

Walkabout wrote:

2 parts hydrogen 16 parts oxygen=18 Total parts

2x+16x=18x---->144/18, x=8 8*16=128 parts oxygen

D
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Re: Water consists of hydrogen and oxygen, and the approximate [#permalink] 04 Jan 2013, 20:12

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Water consists of hydrogen and oxygen, and the approximate

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Water consists of hydrogen and oxygen, and the approximate

Water consists of hydrogen and oxygen, and the approximate

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