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Svetllana [295]
2 years ago
14

Cho 700ml dung dịch NaOH 0.1M vào 100ml dung dịch AlCl3 0.2M. Tính khối lượng kết tủa sau phản ứng

Chemistry
1 answer:
Licemer1 [7]2 years ago
8 0
English ? i can’t understand
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A unit for measuring work is called the _____.<br><br> horsepower<br> effort<br> time<br> foot-pound
Effectus [21]

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A unit for measuring work is called the foot-pound

4 0
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A sperm cell from a male cat contains 19 chromosomes. When it reproduces with a female cat, how many chromosomes in total will a
Ilya [14]

Answer:

38

Explanation:

19

it is impossible that there is only sperm .egg must be present from female

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19 from male and 19 from female

it is correct

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if cat has it will be abnormal due to unequal chromosome

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also not possible

3 0
3 years ago
Which of the follow statements about isotopes is NOT correct?
worty [1.4K]

Answer: B- Isotopes are often used for dating artifacts and fossils is incorrect.

Explanation: I hope that helped

8 0
2 years ago
1. How many moles of Cu are in 1.48 × 1025 Cu atoms?
morpeh [17]
1 mole ------------- 6.02 x 10²³ atoms
( moles Cu) ------- 1.48 x 10²⁵ atoms

moles Cu =  ( 1.48 x 10²⁵ ) x 1 / 6.02 x 10²³

moles Cu = 1.48 x 10²⁵ / 6.02 x 10²³

=<span> 24.58 moles of Cu</span>

<span>hope this helps!</span>
6 0
3 years ago
1. Methane (CH4) combusts as shown in the equation below. If 3 moles of methane were used in the combustion, what would be the c
umka2103 [35]

Answer:

The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ

Explanation:

<u>Step 1: </u>The balanced equation

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)   ΔH = -802 kJ

<u>Step 2:</u> Given data

We notice that for 1 mole of methane (CH4), we need 2 moles of O2 to produce : 1 mole of CO2 and 2 moles of H20.

The enthalpy change of combustion, given here as  Δ H , tells us how much heat is either absorbed or released by the combustion of <u>one mole</u> of a substance.

In this case: we notice that the combustion of 1 mole of methane gives off (because of the negative number),  802.3 kJ  of heat.

<u>Step 3: </u>calculate the enthalpy change  for 3 moles

The -802 kj is the enthalpy change for 1 mole

The change in enthalpy for 3 moles = 3* -802 kJ = -2406 kJ

The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ

5 0
3 years ago
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