PLEASE HELPPP ME Use the following balanced chemcial equation to answer the question below.

CaBr2 + Na2SO4 --> CaSO4 + 2NaBr

1. How many moles of sodium bromide can be made from 5 moles of calcium bromide

2. How many grams of calcium sulfate will be made from 2.00 moles of calcium bromide

3. How many grams of calcium bromide will be needed to make 845 grams of calcium sulfate

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

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