In a combination reaction, 1.62 g of lithium is mixed with 6.87 g of oxygen. Answer a, b, and c. I am lost. a) Which reactant is present in excess?

b) How many moles of the product are formed?

c) After the reaction, How many grams of each reactant and product are present?

Blank g Li

Blank g O2

Blank g LI2O

personal, she chose to do it.

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.