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Someone answer these questions pls i don’t understand

Someone answer these questions pls i don’t understand-example-1
User Sam Rogers
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#2: B. 6.2g

Reason: Fill out the formula with information given.

350J = 2.1 J/(gxc) x m x 27c

Then divide 350J by 2.1 x 27 = m

m = 6.2 grams

#3: B. Exothermic reaction

Reason: If the energy released is less than energy of reactant then it is exothermic.

#4: D. 1.1 x 10^4

Reason: q = 4.184J/(gxc) x 75.0g x 35c (change in temp.)

This equals = 10983
But remember that sig figs are important! So this ends up being 1.1 x 10^4 to accommodate for the sig figs.

Hope this helps ^_^ !
User Yehoshua
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