3 years ago

Which is true?

Chemistry

1 answer:

FromTheMoon [43]3 years ago

3 0

Answer: I think it's D

Explanation: None of the other options are true.

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How does salt alter the boiling point and freezing point of water

masha68 [24]

Answer:

adding salt is like adding an impurity therefore the boiling point might increase from 100°c to maybe 102°c

8 0

3 years ago

Using the following equation for the combustion of octane, calculate the heat associated with the combustion of 100.0 g of octan

Sonja [21]

Answer: B) -4819 kJ

Explanation:

The balanced reaction for combustion of octane is:

$2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O$ $\Delta H^0_{rxn}=-11018kJ$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

given mass of octane = 100.0 g

Molar mass of octane = 114.33 g/mol

Putting in the values we get:

$\text{Number of moles}=\frac{100.0g}{114.33g/mol}=0.8747moles$

According to stoichiometry:

2 moles of octane give heat = -11018 kJ

Thus 0.8747 moles of octane give = $\frac{-11018}{2}\times 0.8747=-4819kJ$

Thus -4819 kJ of heat is released by 100.0 g of octane assuming complete combustion.

5 0

4 years ago

Read 2 more answers

Which of the following statements is true?

Dovator [93]

Answer:

Explanation: c

8 0

3 years ago

Read 2 more answers

why do all of these elements- hydrogen, helium, lithium, and beryllium all have negative charges? explain

Dmitry_Shevchenko [17]

They all don’t, they also can have positive charges like LiOH (Lithium Hydroxide)

3 0

3 years ago

The following balanced equation shows the formation of ethane (C2H6).

almond37 [142]

Answer:

Explanation:

Well, we can see from the equation that hydrogen gas and ethane are in a 2:1 ratio based on their mole coefficients.

You need 2 mol H2 to make 1 mol C2H6. So that means you need 2*13.78 mol H2 to make 13.78 mol C2H6!

2*13.78 = 27.56 mol

C is correct.

4 0

4 years ago