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Iteru [2.4K]
3 years ago
12

a bowl of cereal is at a temperature of 62 fahrenheit then the bowl of cereal thermal energy decreases as soon as mass or not ch

ange what is the possible new temperature of the bowl of cereal 53 fahrenheit or 68 fahrenheit
Chemistry
1 answer:
rewona [7]3 years ago
8 0
<h3>Answer:</h3>

  53 fahrenheit

<h3>Explanation:</h3>

Temperature is a measure of thermal energy. It goes down when thermal energy decreases. Of your choices, the temperature lower than 62 °F is 53 °F.

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6 0
1 year ago
2Fe + 6HCl -&gt; 2FeCl3 + 3H2 If 7.0 moles of HCl is added to enough iron that the HCl is completely used up, how many
DENIUS [597]

Answer: 3.5 moles of hydrogen gas will be produced.

Explanation:

The balanced chemical equation is:

2Fe+6HCl\rightarrow 2FeCl_3+3H_2

As HCl gets completely used up, HCl is the limiting reagent.

According to stoichiometry :

6 moles of HCl produces =  3 moles of H_2

Thus 7.0 moles of  HCl produces=\frac{3}{6}\times 7.0=3.5moles  of H_2

 Thus 3.5 moles of hydrogen gas will be produced.

3 0
2 years ago
A 0.3146 g sample of a mixture of NaCl ( s ) and KBr ( s ) was dissolved in water. The resulting solution required 45.70 mL of 0
Masteriza [31]

Answer:

The answer to the question is

The mass percentage of NaCl(s) in the mixture is 49.7%

Explanation:

The given variables are

mass of sample of mixture = 0.3146 g

Volume of AgNO₃ required to react comletely with the chloride ions = 45.70 mL

Concentration of the AgNO₃ added = 0.08765 M

The equations for the reactions oare

NaCl(aq) + AgNO₃ (aq) = AgCl(s) + NaNO₃(aq)

AgNO₃ (aq) + KBr (aq) → AgBr (s) + KNO₃

The equation for the reaction shows one mole of NaCl reacts with one mole of AgNO₃ to form one mole of AgCl

Thus 45.70 mL of 0.08765 M solution of AgNO₃ contains\frac{45.7}{1000} (0.08765) = 0.004 moles

Therefore the sum of the number of moles of Br⁻ and Cl⁻

precipitated out of the solution =  0.004 moles

Thus if the mass of NaCl in the sample = z then the mass of KBr = y

However the mass of the sample is given as 0.3146 g which  means the molarity of the solution is 0.004 moles

given by

\frac{z}{58.44} + \frac{y}{119} = 0.004 moles  and z + y = 0.3146

Therefore z = 0.3146 - y which gives

\frac{(0.3146-y)}{58.44} + \frac{y}{119} = 0.004 moles

-8.7×10⁻³y +0.54×10⁻³ = 0.004

or 8.7×10⁻³y = 1.37769× 10⁻³

y = 0.158 g and z = 0.156 Thus the mass of NaCl = 0.156 g and the mass percentage = 0.156/0.3146×100 = 49.7% NaCl

The mass percentage of NaCl(s) in the mixture is 49.7%

8 0
3 years ago
What type of change is boiling water? Why?
Kobotan [32]
It'd be a physical change. This is because it's a change in the state of matter and not altering the chemical structure of water
5 0
3 years ago
Read 2 more answers
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