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denis23 [38]
3 years ago
13

Find the molar mass of potassium dichromate, K2Cr2O7

Chemistry
1 answer:
prisoha [69]3 years ago
6 0
The molar mass of K is 39, Cr is 52, and O is 16. The rough calculation of these numbers are 294. 
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If water were a non-polar<br> Molecule
JulijaS [17]

Answer:

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8 0
2 years ago
How many half-lives will pass by the time 1.56% of I-131 is present? B. Approximately how many days does that equal? *
serg [7]

Answer: Hmmmmm that's crazy....

There are a couple of equations one could use for this type of problem, but I find the following to be the easiest to use and to understand.

Fraction remaining (FR) = 0.5n

n = number of half lives that have elapsed

In this problem, we need to find n and are given the FR, which is 1.56% or 0.0156 (as a fraction).

0.0156 = 0.5n

log 0.0156 = n log 0.5

-1.81 = -0.301 n

n = 6.0 half lives have elapsed

Explanation:

Just wanted to help. Hopefully it's correct wouldn't want to waster your time ;)

6 0
2 years ago
Which of the following shows a correct base pairing in DNA
statuscvo [17]
DNA bop it does not say it in my test
6 0
2 years ago
On x
Lena [83]

Answer:

2

Explanation:

1+1=2

6 0
2 years ago
Dinitrogen tetraoxide, a colorless gas, exists in equilibrium with nitrogen dioxide, a reddish brown gas.
viktelen [127]

Explanation:

N2O4(g)  <----------> 2NO2(g)

Before proceeding,

A chemical equilibrium can be defined as a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

Statement 1.

This statement is false. Equilibrium is not about equal concentrations but rather zero change in concentration of the reactants and products.

Statement 2.

This statement is True in chemical equilibrium; the forward and reverse reactions occur at equal rates.

Statement 3.

This statement is False. The rate constant for the forward reaction is not equal to the rate constant of the reverse reaction.

Statement 4.

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Kc= [NO2]2 / [N2O4]

This statement is false.

3 0
3 years ago
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