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Basile [38]
3 years ago
9

How do you know if a reaction is endothermic

Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
7 0
If the temperature rises in a reaction. Exothermic is if it loses heat. 

Have a nice day, brainliest would be fantastic.
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PLEASE HELP!! 40 POINTS
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Answer:

1) 6.524779402×10^(-17)  

2)521.1g

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3 years ago
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What is the mass in grams of 0.000142 mol of vitamin c
bazaltina [42]

Answer:

0.0250 g

Explanation:

Step 1: Determine the molar mass of Vitamin C.

The molar mass is the mass in grams corresponding to 1 mole. In order to calculate the molar mass of vitamin C (C₆H₈O₆) we need to add the molar masses of the elements that compose it.

M(C₆H₈O₆) = 6 × M(C) + 8 × M(H) + 6 × M(O)

M(C₆H₈O₆) = 6 × 12.01 g/mol + 8 × 1.01 g/mol + 6 × 16.00 g/mol

M(C₆H₈O₆) =  176.14 g/mol

Step 2: Calculate the mass corresponding to 0.000142 mol of vitamin C.

0.000142 mol \times \frac{176.14g}{mol} =0.0250 g

7 0
3 years ago
HURRY IT'S URGENT!!!
Nady [450]

Answer:

convection

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as air is heated, it rises up and away from the heat source, cools then falls closer to the heat source over and over again.

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An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. the heavier two isotopes have an abu
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Check attached file for solution.

4 0
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How do I do number 64?
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