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Paha777 [63]
3 years ago
8

What is water? pls tell fast

Chemistry
2 answers:
NikAS [45]3 years ago
4 0

The mixture of Hydrogen and oxygen. It keeps all living things alive.

Zigmanuir [339]3 years ago
4 0

It is a chemical substance made of hydrogen and oxygen. Its formula is H2O. It is needed by all organisms in order to survive.

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How many grams of K2Cr207 are in 250. mL of 0.500M of K2Cr207:
goldenfox [79]

<u>Analysing the Question:</u>

We are given a 250 mL solution of 0.5M K₂Cr₂O₇

Which means that we have:

0.5 Mole in 1L of the solution

0.125 moles in 250 mL of the solution      <em>[dividing both the numbers by 4]</em>

<em />

<u>Mass of K₂Cr₂O₇ in the given solution:</u>

Molar mass of K₂Cr₂O₇(Potassium Dichromate) = 194 g/mol

<em>we know that we have 0.125 moles in the 250 mL solution provided</em>

Mass = Number of moles * Molar mass

Mass = 0.125 * 194

Mass = 36.75 grams

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