Question

Help cuz it's due in an hour :/
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Answer 1

Answer:-

2.3 grams

Explanation:-

As we know,

Law of conservation of mass states that number of atoms of each element remains the same before and after a chemical equation. So,

?g+4.5g------> 2.9g+3.9g

Adding 2.9g+3.9g

?g+4.5g= 6.8g

Subtracting 6.8g and 4.5g

=6.8-4.5 =2.3g

Verification:-

2.3g+4.5g------> 2.9g+3.9g

6.8=6.8

LHS=RHS

Our answer is right :p

@QianNiu

Answer 2

Answer:

2.3 is the correct answer