Calculate how many grams of water needed to dissolve 35.00g KNO, at 50.0°C

1 answer:

5 0

Answer:use of significant figures in calculations in Essential Skills 1 () prior to working this example. A Density is mass per unit volume and is usually reported in grams per cubic understand its identity, he found that carbon dioxide dissolved in water to produce compounds were not generally accepted for more than 50 years.

Explanation:

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A mixture 21.7 g NaCl 3.74 g kcl and 9.76 g licl how many moles of nacl are in this mixture

slava [35]

Moles (mol) = mass (g) / molar mass (g/mol)

Mass of NaCl = 21.7 g
Molar mass of NaCl = 58.4 g/mol
Hence, moles of NaCl = 21.7 g / 58.4 g/mol = 0.372 mol

Hence moles of NaCl in the mixture is 0.372 mol.

Let's assume that mixture has only given compounds and free of impurities.
Then, we can present this as a mole percentage.

mole % = (moles of desired substance / Total moles of the mixture) x 100%

Hence,
mole % of NaCl = (moles of NaCl / Total moles of the mixture) x 100%

Total moles of mixture = moles of NaCl + KCl + LiCl

Mass of KCl = 3.74 g
Molar mass of NaCl = 74.6 g/mol
Hence, moles of NaCl = 3.74 g / 74.6 g/mol = 0.050 mol

Mass of NaCl = 9.76 g
Molar mass of NaCl = 42.4 g/mol
Hence, moles of NaCl = 9.76 g / 42.4 g/mol = 0.230 mol

Total moles = 0.372 mol + 0.050 mol + 0.230 mol = 0.652 mol

mole % of NaCl = (moles of NaCl / Total moles of the mixture) x 100%
= (0.372 mol / 0.652 mol) x 100%
= 57.06%

Hence, mixture has 57.06% of NaCl as the mole percentage.

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3 years ago

Estimate the standard internal energy of formation of liquid methyl acetate (methyl ethanoate, ch3cooch3) at 298 k from its stan

LenKa [72]

solution:

$the reaction for formation of methyl acetate is\\CH_{3}OH+CH_{3}COOH----------->CH_{3}COOCH_{3}+H_{2}O\\standard internal energy \\\delta u=\delta H -\delta(pv)=\delta H -\delta n\times RT\\where \delta n=change in number of moles=0\\\delta u=\delta H\\=-442kj/mol$

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Read 2 more answers

41.6 mL of an HCIO2 solution were

WINSTONCH [101]

Answer:

0.0521 M

Explanation:

HClO2 + NaOH ---> NaClO2 + H2O

M(HClO2)V(HClO2) = M(NaOH)V(NaOH)

M(HClO2)*41.6 mL = 0.146 M*14.85 mL

M(HClO2) = 0.146*14.85/41.6 M = 0.0521 M

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3 years ago

In Chemistry, In the following type of shorthand, what does the number next to the element name mean? Hydrogen-3

kupik [55]

the number is the mass number

the mass number is the number of nucleons (total number of protons and neautrons in the nucleus) so in hydrogen-3 there are 3 nucleons and as hydrogen has 1 proton, there are 2 neutrons

carbon 12 has 12 nucleons (6 protons and 6 neutrons) and carbn 13 has 13 nucleons (6 protons and 7 neutrons)

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What happens when a catalyst is used in a chemical reaction

uranmaximum [27]

The reaction rate increases.

Why Well a catalyst usually lower the activation barrier in an energy diagram. The lower and smaller that gap means the reaction is taking place rapidly compared to when that activation barrier gap is higher.

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