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3 years ago

Which chemical symbols will complete the equation for this decomposition reaction?

Chemistry

2 answers:

kondaur [170]3 years ago

6 0

Answer:

Decomposition of KI:

2KI → 2K + 2I

Troyanec [42]3 years ago

3 0

2kl_> 2k +2L for a decomposition reaction

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Convert 1176 mmHg to kPa

OLEGan [10]

Answer:

156.8kPa

Explanation:

The problem here is to convert mmHg to kPa;

We have been given:

1176mmHg and the problem is to convert to kPa;

1000Pa = 1kPa

1 mmHg = 133.322Pa

1176mmHg will give 1176 x 133.322 = 156787.1Pa

To kPa;

156.8kPa

8 0

3 years ago

Which of these elements has the greatest average atomic mass?4

Arte-miy333 [17]

Hi the answer is actually B

7 0

3 years ago

Read 2 more answers

Using the molarity equation, calculate how many grams of salt you need in order to make 80ml of a 2M solution (MW = 58.44g/mole)

ollegr [7]

Answer:

9.35g

Explanation:

The molarity equation establishes that:

$\textrm{molarity}=\frac{\textrm{moles of solute}}{\textrm{liters of solution}}$

So, we have information about molarity (2M) and volume (80 ml=0.08 l), with that, we can find the moles of solute:

$\textrm{moles of solute}=\textrm{molarity}*\textrm{liters of solution}$

$\textrm{moles of solute}= 0.08 \textrm{ l} *2\textrm{ M} = 0.16 \textrm{ mol}$

The mathematical equation that establishes the relationship between molar weight, mass and moles is:

$\textrm{molar weight}= \frac{\textrm{mass}}{\textrm{moles}}$

$\textrm{MW}= \frac{\textrm{m}}{\textrm{n}}$

We have MW (58.44g/mole) and n (0.16 mol), and we need to find m (grams of salt needed) to solve the problem:

$\textrm{m} = \textrm{MW * n}= 58.44\frac{\textrm{g}}{\textrm{mol}} * 0.16 \textrm{ mol} = 9.35 \textrm{ g}$

8 0

4 years ago

The activity of a certain isotope dropped from 3200 ci to 800 ci in 24.0 years. what is the half-life of this isotope (in years)

Alexxx [7]

Ln(800/3200) = - kt
t = 24 years.
ln(0.25) = -k*24
(- 1.3863) = -k*24
1.3863 / 24 = k
0.05776 = k

ln(0.5) = -k*t
-0.6931 = - 0.05776 t
12 = t

I don't know if you can just look at the question and know the answer. If 24 years is a quarter life then is it obvious that the 1/2 life is 12 years? It might be, but the method I've used works for sure.

3 0

3 years ago

Mixtures are classified as homogeneous and heterogeneous according to _____.

Dafna1 [17]

Answer:

i believe its the 1st option

8 0

3 years ago