answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lerok [7]
2 years ago
6

A student performed a recrystallization and after the solid dissolved, the solution was immediately placed in an ice bath. Withi

n a few seconds, a large amount of solid formed and was collected by vacuum filtration. The percent recovery was high but the melting point of the dried solid showed that the solid was contaminated with impurities. Could you explain very specifically why it happened?
Chemistry
1 answer:
Darya [45]2 years ago
5 0
You poop on a pop tart smell like a raw tart you’re welcome
You might be interested in
A mixture of gases containing 0.20 mol of SO2 and 0.20 mol of O2 in a 4.0 L flask reacts to form SO3. If the temperature is 25ºC
diamong [38]

Answer : The pressure in the flask after reaction complete is, 2.4 atm

Explanation :

To calculate the pressure in the flask after reaction is complete we are using ideal gas equation.

PV=n_TRT\\\\P=(n_1+n_2)\times \frac{RT}{V}

where,

P = final pressure in the flask = ?

R = gas constant = 0.0821 L.atm/mol.K

T = temperature = 25^oC=273+25=298K

V = volume = 4.0 L

n_1 = moles of SO_2 = 0.20 mol

n_2 = moles of O_2 = 0.20 mol

Now put all the given values in the above expression, we get:

P=(0.20+0.20)mol\times \frac{(0.0821L.atm/mol.K)\times (298K)}{4.0L}

P=2.4atm

Thus, the pressure in the flask after reaction complete is, 2.4 atm

5 0
2 years ago
Determine the percent yield for the reaction between 6.92 g K and 4.28g of oxygen gas if 7.36 g of potassium oxide is produced.
Illusion [34]

Answer:

percentage yield = 88.25%

Explanation:

Firstly, write the chemical reaction and balance the equation.

Potassium react with oxygen to produce potassium oxide.

K + 02 → K2O

Balance the equation

4K + 02 → 2K2O

The limiting reactant is K so the yield of potassium oxide can be calculated using grams for potassium.

atomic mass of K = 39.1g/mol

grams for 4 mole of potassium =  4(39.1) = 156.4 g

grams for 2 moles of K2O = 2( 39.1 × 2 + 16) = 188.4 g

If 156.4 g of K produces 188.4 g of K2O

6.92 g of K will produce ? gram of K2O

cross multiply

grams of K2O = 6.92 × 188.4/156.4

grams of K2O = 1303.72/156.4

grams of K2O = 8.33585677749

grams of K2O = 8.34 g

percentage yield = actual yield/theoretical yield × 100

actual yield = 7.36 g

theoretical yield = 8.34 g

percentage yield = 7.36/8.34 × 100

percentage yield =         736/8.34

percentage yield = 88.2494004796%

percentage yield = 88.25%

5 0
2 years ago
What is the mass of a sample of water containing 3.55×1022 molecules of h2o?
ad-work [718]
6,02×10²³ -------------- 18g
3,55×10²² --------------  xx=\frac{3,55*10^{22}*18g}{6,02*10^{23}}=10,61*10^{22-23}g=10,61*10^{-1}g=1,061g


6 0
2 years ago
Read 2 more answers
Show that the Newton has the units of mass times acceleration
Dimas [21]

F = ma = (kg)(m/s2) = kg ´ m/s2 N

hope this helps :D

7 0
2 years ago
To find the Ce4+ content in a solid sample, 4.3718 g of the solid sample were dissolved and treated with excess iodate to precip
gulaghasi [49]

Answer:

3.43 %

Explanation:

We need  to calculate first the number of moles of CeO2 produced in the combustion. Given its formula we know how many moles of Ce atom are present. From there calculate the mass this number of moles this represent and then one can calculate the percentage.

0.1848 g CeO2 x 1 mol CeO2/172.114g = 0.00107 mol CeO2

0.00107 mol CeO2 x 1 mol Ce/ 1 mol CeO2 = 0.00107 mol Ce

.00107 mol Ce x 140.116 g Ce/ mol  =  0.150 g Ce

0.150 g Ce/ 4.3718 g sample  x 100 = 3.43 %

5 0
2 years ago
Read 2 more answers
Other questions:
  • Determine the mass of oxygen in a 7.20 g sample of Al2(SO4)3.
    9·2 answers
  • if the solubility of a gas is 7.5 g/L at 404 pressure, what is the solubility of the gas when the pressure is 202 kPa?
    9·2 answers
  • Twenty-seven milliliters of an acid with an unknown concentration are titrated with a base that has a concentration of 0.55 M. T
    10·2 answers
  • Match each term to a correct example from the chemical equation: 2A + B2 → 2AB.
    6·1 answer
  • After a reaction, a new compound contains 0.73 g Mg and 0.28 g N. What is the empirical formula of this compound?
    12·1 answer
  • A 60.0 mL sample of 0.250 M NaOH is added to a beaker containing 125 mL of 0.120 M HOCl. Ka for HOCl is 3.5 x 10-8 at 25o C. Fin
    6·1 answer
  • Acid deposition would most likely result in_________
    8·1 answer
  • Draw the Lewis structures for CH3OH, CH2O and HCOOH. Indicate the hybrid orbital used in the sigma bonds for each of the carbon
    7·1 answer
  • Quantization of energy lab Hypothesis: Make a prediction that describes the relationship between the composition of an unknown s
    13·2 answers
  • A tetrahedral carbon is ____________ hybridized while a linear carbon is ____________ hybridized. Two different compounds that h
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!