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zhannawk [14.2K]
3 years ago
9

Could someone please help me??

Chemistry
2 answers:
gizmo_the_mogwai [7]3 years ago
8 0

7.9×10^-1 Kg/m³

or, 0.79 Kg/m³

Hope it helps you...

zloy xaker [14]3 years ago
8 0

Answer:

okay in converting g to kg divide my 1000 and in converting cm³ to m³ divide by 1000000

7.9 x 10^-4 g/cm³ to kg/m³

we divide by 1000 and at the same time by 1000000

so that gives 1000000/1000 (it flips)

so we have 7.9 x 10^-4 x 1000000/1000

that gives 7.9 x 10 ^-1 kg/m³

which is 0. 79 kg/m³

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<h3>How to find the number of moles ?</h3>

Moles water = \frac{\text{Given mass}}{\text{Molar Mass}}

                     = \frac{0.48\ g}{18\ \text{g/mol}}

                     = 0.0266 moles  

                   

Heat lost by water = 0.0266 mol x 44.0 kJ/mol

                                = 1.17 kJ

                                = 1170 J           [1 kJ = 1000 J]

Heat lost = Heat gained

Heat gained by aluminum = 1170 J  

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1170 + 1242 = 49.7 T  

T = 48.5°C (49°C at two significant figures)

Thus from the above conclusion we can say that The final temperature in Celsius of the metal block is 49°C.

Learn more about the Moles here: brainly.com/question/15356425

#SPJ1

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