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slamgirl [31]
3 years ago
9

How many molecules of ammonia will be produced? 4 2 8 6

Chemistry
1 answer:
Julli [10]3 years ago
7 0

Answer:

4

Explanation

i just know the answer

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What mass of solid that has a molar mass 89.0 g/mol should be added to 100.0 g of benzene to raise the boiling point of benzene
taurus [48]

On the basis of given data:

Mass of solvent (benzene) = 100 gm or 0.1 Kg

Molar mass of solute (solid) = 89 g/mol

Increase in boiling point (deltaTb) = 2.42 degree C

The boiling point elevation constant k = 2.53 C.kg/mol

There is a need to determine the mass of the solid to be added, the elevation in boiling point is proportional to the m (molality) of the solute;

ΔTb = k.m

Here, m that is molality = moles of solute/kg of solvent

Therefore,

ΔTb = k (benzene) × moles of solid/kg of benzene

2.42 = 2.53 × moles of solid/0.1

moles of solid = 0.0956 moles

The molar mass of solid = 89 g/mol

Thus, the mass of solid = 0.0956 moles × 89 g/mol

= 8.508 g

Thus, the mass of solid to be added is 8.508 g.

3 0
3 years ago
(b)Calculate the number of moles of CuSO4 that were in the impure sample of CuSO4(s) .
irga5000 [103]

Answer:

The questions are incomplete

Explanation:

(b) This question is incomplete. However to calculate the number of moles of CuSO₄ present in the impure sample. The formula below can be used;

number of moles = mass of CuSO₄ present in the impure sample ÷ molar mass of CuSO₄

(c) This question is also incomplete. However, to calculate the mass percentage of CuSO₄ present in the impure sample of CuSO₄, the formula below can be used.

Mass percentage of CuSO₄ =

mass of CuSO₄ present in the impure sample/mass of impure CuSO₄ × 100

Thus, the mass of the impure sample must be measured also since the actual mass of the CuSO₄ present in the impure sample must have been measured before calculating the number of moles.

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The answer is burning paper

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Steroids are like hormones that greatly influences bodily activities mostly in growth and function. These functions may modify, change and control one’s body organs or system that’ll vary in form, shape or structure due to these hormone-like compounds and also, it can affect one’s psychological and neurological state. There are several types of steroids. Examples can include: <span><span>
1. </span>Sex steroids. These are can influence reproduction and sex characteristics.</span> <span><span>
2. </span>Anabolic steroids. Most abused in many athletic activities. These steroids are used for muscle and bone growth. </span>



3 0
3 years ago
What is released when an excited electron returns to a lower energy state?
Jobisdone [24]

Answer:

Light

Explanation:

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