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3 years ago

What is a melting point

Chemistry

2 answers:

Vedmedyk [2.9K]3 years ago

6 0

Answer:

the temperature at which a given solid will melt.

Explanation:

motikmotik3 years ago

4 0

Answer:

The lowest temperature at which a substance melts

Explanation:

You might be interested in

Charle's Law

Andrej [43]

Convert temperature to Kelvin

27°C=300K
150°C
423K

Apply Charles law

V1T2=V2T1
6(423)=27V2
2538=27V_2
V2=94L

6 0

3 years ago

How many moles are in 225 grams is NaCl

babunello [35]

Explanation:

Stoichiometry is the quantitative study of the mass relation of reactants and products in a chemical reaction to determine the amount of reactant required for a reaction to produce a specified quantity or to determine the theoretical yield for the products.

The mole is an SI base unit to measure the amount of elementary entities (atom, molecules, ions, electrons, particles, etc.) of a given mass of a particular substance. One mole is the quantity of a substance exactly equal to Avogadro's number which is approximately 6.022 $\times \ 10^{23} \ \ \text{mol}^{-1}$ .

For a stoichiometric calculation for gram-to-mole conversion, the conversion follows the relation

$n \ = \ \displaystyle\frac{m}{M_{r}}$ ,

where $n$ is the number of moles of a given substance, $m$ is the mass of the substance and $M_{r}$ is the molecular weight of the substance.

Given that the substance of interest is sodium chloride, NaCl, the molecular weight of the compound is

$M_{r} \ = \ A_{r}(\text{Na}) \ + \ A_{r}(\text{Cl}) \\ \\ M_{r} \ = \ 23 \ + \ 35.45 \\ \\ M_{r} \ = \ 58.45 \ \text{g mol}^{-1}$ ,

where $A_{r}$ is the atomic mass of the element.

Therefore, the number of moles of sodium chloride is

$n \ = \ \displaystyle\frac{255 \ \text{g}}{58.45 \ \text{g mol}^{-1}} \\ \\ n \ = \ 4.363 \ \text{mol} \ \ \ \ \ \ \ \ (\text{4 \ s.f.})$

4 0

2 years ago

Which of the following units is a derived unit? Second Meter Density Ampere

laiz [17]

Density because you have to use volume and mass to get it. (Density=mass/volume)

8 0

3 years ago

Read 2 more answers

What are the components of black powder? What are the ratios of these components?

NeTakaya

75:15:10. componets inlcude mixture of sulfur, charcoal, and potassium nitrate (saltpeter)

6 0

4 years ago

Compounds A and B react to give a single product, C. Write the rate law for each of the following cases and determine the units

emmasim [6.3K]

Answer:

Explanation:

Rate laws are mathematical expressions which define the relationship that exists between the rate of a chemical reaction and the concentration of the reacting components. Rate laws take the following form:

$rate = k [A]^{x} [B]^{y} [C]^{z}$ ...

where k = rate constant

[A], [C] and [C] represent the molar concentrations of the reactants

k, x, y, and z are determined experimentally by observing how the rate of reaction changes with the concentrations of the reactants.

If x=1, the reaction is first order for [A]. Also, if y=2, the reaction is second order for [B] and so on...

The overall order of the reaction is the sum of the orders with respect to each reactant. Therefore, the overall order of the reaction is x+y+z.

5 0

3 years ago