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WARRIOR [948]
4 years ago
5

How would you obtain ethanol from rice starch?​

Chemistry
1 answer:
sergejj [24]4 years ago
5 0

Answer:

By putting the rice in water

Explanation:

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Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho
german

Answer:

The value is Z  =  311.33 \ g/mol

Explanation:

From the question we are told that

The mass of saxitoxin is m  =  12.5 mg = 12.5 * 10^{-6} g

The volume of water is V  =  3.10  mL  =  3.10 *10^{-3} L

The osmotic pressure is P =  0.236 =  \frac{0.236}{760}  =  3.105 * 10^{-4} atm

The temperature is T  =  19^oC  =  19 + 273 =  292 \  K

Generally the osmotic pressure is mathematically represented as

P  =  C  *  T  * R

Here R is the gas constant with value

R =  0.0821 ( L .atm /mol. K)

and C is the concentration of saxitoxin

So

3.105 * 10^{-4}  =  C * 0.0821   *  292

C = 1.295 *10^{-5} mol/L

Generally the number of moles of saxitoxin is mathematically represented as

n = C  *  V

=> n = 1.295 *10^{-5}   *3.10 *10^{-3}

=> n = 4.015 *10^{-8} \  mol

Generally the molar mass of saxitoxin is mathematically represented as

Z  =  \frac{m}{n}

=> Z  =  \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}

=> Z  =  311.33 \ g/mol

5 0
4 years ago
Need help balancing these ​
kari74 [83]
The answer would be 1,3,1,3
3 0
3 years ago
Read 2 more answers
Hạt nhân của nguyên tử X có điện tích là 30,4.10-19 culông. Tìm số p,e của nguyên tử X
Maslowich

Answer:

Hạt nhân của nguyên tử X có điện tích là 30,4.10-19 culông. Tìm số p,e của nguyên tử X

5 0
3 years ago
44.90 g of reactants are placed in a beaker
sergiy2304 [10]

Answer:

D. -1882J

Explanation:

We can solve the energy released in a chemical reaction in an aqueous medium using the equation:

Q = -m*C*ΔT

<em>Where Q is energy (In J),</em>

<em>m is mass of water (45.00g)</em>

<em>C is specific heat of water (4.184J/g°C)</em>

<em>And ΔT is change in temperature (25.00°C - 15.00°C = 10.00°C)</em>

<em />

Replacing:

Q = -45.00*4.184J/g°C*10.00°C

Q = -1882J

Right answer is:

<h3>D. -1882J</h3>

<em />

7 0
3 years ago
Which is a physical change? A) Rusting iron B) Burning paper C) Reacting baking soda and vinegar D) Separating a mixture of salt
Deffense [45]

Answer:

D

Explanation:

7 0
3 years ago
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