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Alborosie
3 years ago
15

Which statement is always true for exothermic reactions? (1 point)

Chemistry
1 answer:
Kipish [7]3 years ago
7 0

Answer:

it’s the third one for sure

Explanation:

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se disuelve dicromato de potasio k2Cr2O7 en agua para hacer 300mL de solucion. si la molaridad de la solucion se desea que sea 0
Westkost [7]

Answer:

0.0375 moles.

11.03 gramos.

Explanation:

¡Hola!

En este caso, dado que la definición de molaridad viene dada por:

M=\frac{mol}{V}

En dónde el volumen viene dado en litros, primero es necesario convertir 300 mL a litros:

V=300mL*\frac{1L}{1000mL}=0.300L

Ahora, cómo se nos da la molaridad y el volumen, es posible calcular las moles como sigue:

mol=M*V\\\\mol=0.125mol/L*0.300L\\\\mol=0.0375mol

Seguidamente, como la masa molar del dicromato de potasio es 294.18 g/mol, la masa a pesar será de:

m=0.0375mol*\frac{294.18g}{1mol} \\\\m=11.03g

¡Saludos!

4 0
3 years ago
What is the element (periodic table of elements) of an m&m
diamong [38]

Answer:

Explanation:

There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.

5 0
3 years ago
A ball sits on top of a hill. The wind blows and the ball begins rolling down the hill. What caused the ball to start moving?
ELEN [110]
The answer should be a
4 0
4 years ago
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What is the balanced equation and chemical reaction for HgO Hg  + O2
nikdorinn [45]
2HgO ---> 2Hg + O₂

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6 0
4 years ago
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When water dissolves sugar which process is not involved
Scrat [10]

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ionization

dissociation

4 0
4 years ago
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