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lutik1710 [3]
3 years ago
12

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride?

Chemistry
1 answer:
irga5000 [103]3 years ago
6 0

Answer:

Option A.

Explanation:

This is the reaction:

2Na + Cl₂ → 2NaCl

By stoichiometry, ratio is 2:2. So 2 mol of NaCl are produced by 2 moles of Na.

So the answer is 3.6 moles

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If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?
rewona [7]

<u>Answer:</u>

<em>When we finish, the temperature would be 32.5℃</em>

<em></em>

<u>Explanation:</u>

Density of water = mass/volume

So,

Mass of water = Density × Volume

\\\\$=1.0   \times  2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$

$Q=m \times c \times \Delta T$

where

\Delta T = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0  cal/(g℃))  

m is the mass of water

plugging in the values  

$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$

\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$

Final T = ∆T + Initial T

= 7.5℃ + 25℃ = 32.5℃ (Answer).

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What is the independent variable of the penny lab
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During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking
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A standard 10.00 g mass is weighed on an analytical balance 100 times. The average and standard deviation obtained gives 10.12 ±
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Answer:

There was an improvement in accuracy. There was no change in precision.

Explanation:

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