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nalin [4]
3 years ago
11

A system conducts 50. J heat to the surroundings while delivering 20. J of work. What is the change in internal energy

Chemistry
1 answer:
Alexeev081 [22]3 years ago
8 0
1. “what forms of energy conversions occur during the process of photosynthesis? (How does energy transform?) 2. What is missing from the food web but is essential to maintain equilibrium? A. Soil B.water C. Decomposers D. Oxygen
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Liquid butane, C4H10, is stored in cylinders to be used
Ganezh [65]

Answer:

  • <u>13.0kJ</u>

Explanation:

The<em> heat</em> to <em>vaporize</em> a l<em>iquid</em> is equal to the amount of liquid in moles multiplied by the specific <em>heat of vaporiztion</em> per mole.

First, calculate the number of moles in 35.5g of <em>butane</em>.

  • Molar mass of butane: 58.124 g/mol

  • Number of moles = mass in grams/molar mass

  • Number of moles = 35.5g / 58.124g/mol = 0.6107632mol

Now, calculate the heat to vaporize that amount of <em>liquid butane</em>:

  • Heat = number of moles × specific heat of vaporization

  • Heat = 0.6107632mol × 21.3kJ/mol = 13.0 kJ

The answer must be reported with 3 significant figures.

3 0
4 years ago
In word equations, what do plus signs actually mean?
shepuryov [24]
<span>It means that your combining those two chemical substances</span>
3 0
4 years ago
Read 2 more answers
An increase in mass will​
maks197457 [2]

Answer:

As an object increases in speed, so does the amount of energy that it has, this energy is what we refer to as 'the increase in mass'

Explanation:

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3 0
4 years ago
What is the [OH-] in a solution that has a [H3O+] = 1.0 x 10-6 M?
nika2105 [10]

Answer:

explanation

kw = 1 \times  {10}^{ - 14}

oh =  {?}

h3o = 1.0 \times 10 {}^{ - 6}

formula

kw = h3o \times oh

insert \: values

1.0 \times 10  {}^{ - 14}  = 1.0 \times  {10}^{ - 6}  \times oh

\frac{1.0 \times 10 {}^{ - 14} }{ 1.0 \times 10 {}^{ - 6} }  = oh

1 \times  {10}^{ - 8}

7 0
3 years ago
How many capsules containing 75mg of Tamiflu could be produced from 155g of star anise.?
jeyben [28]
From the question you will find that:
one capsule of tamiflu is obtained from 2.6 g of star anise.
1 capsule   = 2.6 g tamiflu
? capsules = 155 g tamiflu
by cross multiplication = \frac{(1 x 155)}{2.6} = 59 capsules
7 0
4 years ago
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