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pickupchik [31]
3 years ago
6

Robert says the expression 2+3 times 7 and 2+(3 times 7) have the same value. Is Robert correct? Explain your answer and evaluat

e each expression
Mathematics
1 answer:
erastovalidia [21]3 years ago
4 0
Yes because you multiply first so in this case you multiply 7 and 3 first. Since the second expression is in parenthesis you do that first just like you do 7 times 3. Then you just add 2 to that. The value of both expressions is 23
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Answer:

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Step-by-step explanation:

The required mass of reactants can be computed from the number of moles of product.

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Then the mass of Zn required is ...

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_____

<em>Comment</em>

The discrepancy in the last two decimal places of the weights above versus the calculator output below comes from rounding of moles of Zn to 4 significant digits, instead of 5 or more. The number of moles of ZnCl₂ is closer to 0.0110066.

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