3 years ago

Does anyone know how to do this ??

Chemistry

1 answer:

lord [1]3 years ago

7 0

Answer:

Look at your periodic table

Explanation:

It tells you everything like Potasium 1 and 1 ox and 1 hydrogen

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Un gas a una temperatura de 38°C, tienen un volumen de 21 Lts Litros. ¿Qué volumen tendrá si la temperatura sube a 67°C?.

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Answer:

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3 years ago

A 78.0 g sample of an unknown compound contains 12.4 g of hydrogen. what is the percent by mass of hydrogen in the compound?

AleksandrR [38]

Formula to find the percent composition of an element in a compound is $\frac {MolarMassOfElement}{MolarMassOfCompound}*100$ .

Now enter the variables into the formula.

$\frac {12.4}{78.0}*100 = 15.897$ %
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How many moles of KNO3 are needed to make 600 ml of a 1.3M solution?

ludmilkaskok [199]

M = n / V

Where, M is molarity (M or mol/L), n is number of moles of the solute (mol) and V is volume of the solution (L).

Here the solute is KNO₃.
The given molarity is 1.3 M
This means 1L of solution has 1.3 moles of KNO₃.

Hence moles in 600 mL = 1.3 M x 0.6 L = 0.78 mol

Therefore to make 1.3 M KNO₃ solution, needed moles of KNO₃ is 0.78 mol

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