All categories

3 years ago

Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.

Chemistry

1 answer:

steposvetlana [31]3 years ago

3 0

Answer:

0.0125mol

Explanation:

Molarity (M) = number of moles (n) ÷ volume (V)

n = Molarity × Volume

According to this question, a 0.05M solution contains 250 mL of NaOH. The volume in litres is as follows:

1000mL = 1L

250mL = 250/1000

= 0.250L

n = 0.05 × 0.250

n = 0.0125

The number of moles of NaOH is 0.0125mol.

You might be interested in

qaws [65]

The answer is conduction

3 0

3 years ago

Read 2 more answers

How many grams of moles are in 94.2 g of C02?

notsponge [240]

Answer:

Moles to grams carbon dioxide

1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.

Explanation:

Moles to grams carbon dioxide

1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.

5 0

3 years ago

Atrazine is an herbicide widely used for corn and is a common groundwater pollutant in the corn-producing regions of the United

riadik2000 [5.3K]

Answer:

0.94

Explanation:

Let's assume that the total sample of the soil is 1 cm³; which has a porosity of 0.4 cm³; then the original sample of the soil will be 0.6 cm³

The mass of the soil particles in 1 cm³ of soil + water = 0.75 g

The fraction of the total atrazine can be calculated by the expression;

Total atrazine = $C_w(\frac{g}{mL})*V_w(mL)+C_{(soil)}(\frac{g}{soil})*M_{(soil)}(gsoil)$

Also; $C_{(soil)}(\frac{g}{soil})= K_{oc}(\frac{mL}{gOC})*f_{oc} (\frac{gOC}{gsoil})*C_w(\frac{g}{mL})$

NOTE THAT: $K_{oc}( \frac{mL}{gOC})=K_{oc}\frac{L}{kgOC}$

Total atrazine can now be calculated as:

$C_w*0.4+K_{oc}f_{oc}C_w*0.75$ = $\frac{C_{soil}*M_{soil}}{Total atrazine}$

$=\frac{K_{oc}f_{oc}C_w*M_{soil}}{C_w*0.4+K_{oc}f_{oc}C_w*0.75} = \frac{0.75*K_{oc}f_{oc}}{0.4+K_{oc}f_{oc}*0.75}$

$= \frac{10^{2.52}*0.025*0.75}{0.4+10^{2.52}*0.025*0.75}$

= 0.94

Thus,the fraction of total atrazine that will be adsorbed to the soil = 0.94.

3 0

4 years ago

The first five questions refer to the following problem:

MariettaO [177]

The Acceleration of a model rocket = 4 m/s²

<h3>Further explanation </h3>

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object

∑F = m. a

$\large{\boxed{\bold{a=\frac{\sum F}{m}}}$

F = force, N

m = mass = kg

a = acceleration due to gravity, m / s²

An upward thrust of 35 N

A model rocket has a mass of 2.5 kg(weight = 25 N)

so resultant force :

$\tt \sum F=F~upward~thrust-F~weight\\\\\sum F=35-25\\\\\sum F=10~N$

The acceleration :

$\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{10}{2.5}\\\\a=4~m/s^2$

3 0

3 years ago

Which changes would cause an increase in the resistance of a wire? Check all that apply.

OLEGan [10]

Answer:

increasing its temperature

using a longer wire

using a thinner wire

6 0

3 years ago

Read 2 more answers