# Science

What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen?
14.0 g (I'm thinking this.)
16.0 g
18.0 g
20.0 g

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1. I'm thinking you're guessing.
This starts out to be a limiting reagent problem.
2H2 + O2 ==> 2H2O

mols oxygen = 16/32 = 0.5 mol.

Using the coefficients in the balanced equation, convert mols each to mols product.
1 mol H2 x (2 mols H2O/2 mols H2) = 1 mol H2O
0.5 mol O2 x (2 mols H2O/1 mol O2) = 1 mol H2O.
Each will produce 1 mol H2O. Therefore, mass H2O produced = mols x molar mass
1 mol x 18 g/mol = ?

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D
C
B
B
Trust me those are the answers.
This is the answers to Unit 2 Physical and Chemical Changes.

Enjoy :) Bilbo

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posted by BILBO
3. Bilbo is right 4/4 100%

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posted by zxcvbnm
4. Bilbo is correct

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5. Bilbo's right thanksss

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posted by Margo
6. bilbo is correct thanks bilbo

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7. Bilbo is correct for connexus "physical and chemical changes" i just got 4/4 :)

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posted by Vixen
8. Bilbo THANK YOU!!! I needed 4/4!!! Trust Bilbo he is 100% correct on Unit 2 Lesson 5 Physical and Chemical Changes 8th Grade Science!!!!!!!!!!!

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9. Right

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