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3 years ago

Complete the blank with the correct answer choice. 20 kilograms = _______ grams A. 20 B. 200 C. 2,000 D. 20,000

Chemistry

1 answer:

AVprozaik [17]3 years ago

3 0

Answer:

20 kg = 20000 g

Option d

Explanation:

1 kg = 1000 g

20 kg . 1000 = 20000 g

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A titration was performed on 50.0mL of 0.250 M NaOH.After the

777dan777 [17]

Answer:

1.750 M

Explanation:

In case of titration , the following formula can be used -

M₁V₁ = M₂V₂

where ,

M₁ = concentration of acid ,

V₁ = volume of acid ,

M₂ = concentration of base,

V₂ = volume of base .

from , the question ,

M₁ = ? M

V₁ = 7.14 mL

M₂ = 0.250 M

V₂ = 50 mL

Using the above formula , the molarity of acid , can be calculated as ,

M₁V₁ = M₂V₂

M₁ * 7.14 mL = 0.250 M * 50mL

M₁ = 1.750 M

Hence, the molarity of the hydrochloric acid = 1.750 M

6 0

3 years ago

What are isotopes..??

tatuchka [14]

Answer:

each of two or more forms of the same element that contain equal numbers of protons but different number of nurtrons

in there nucleir

Explanation:

.....

6 0

3 years ago

Archeologist discovered a silver crown in an ancient tomb and sent it for analysis. You placed the crown in a tub of water and f

gulaghasi [49]

Answer:

Explanation:

The density of pure lead is 10.49g/cm³

Given parameters:

Volume of water displaced by the crown = 238.1ml

Mass of crown = 2.50kg

Solution

We would simply find the density of the discovered crown and compare with that of the standardized density of lead.

Density is an intensive property of matter and it is the same for any form of matter. It is amount of substance per unit volume:

Density = $\frac{mass}{volume}$

We need to convert the given parameters to standard unit,

1ml = 1cm³

Therefore, the volume of water displaced is 238.1cm³

Also,

1kg = 1000g

2.5kg = 2500g

mass of the crown is 2500g

Density = $\frac{2500}{238.1}$ = 10.49g/cm³

The crown is made of silver because the density matches with that of pure silver.

8 0

3 years ago

Predict the substance that will form a precipitate with aqueous solution of barium chloride<br>

Pavlova-9 [17]

Answer:

barium sulphate

Explanation:

5 0

3 years ago

Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005 g sample of menthol is comb

larisa [96]

Answer:

molecular formula = C₁₀H₂₀O

Explanation:

the carbon dioxide is obtained on combustion from an organic molecule due to reaction of carbon with oxygen and water is formed due to reaction of hydrogen with oxygen to form water.

The reactions are:

$C+O_{2}--> CO_{2}\\H_{2}+ 0.5O_{2} --->H_{2}O$

From above equations

i) 44g of carbon dioxide is formed from 12g of carbon

Therefore 0.2829g of carbon dioxide must be formed from = $\frac{12X0.2829}{44}=0.077 grams$ of carbon

ii) 18g of water is formed from 2 grams of hydrogen

Therefore 0.1159 grams of water must be formed from =

$\frac{2X0.1159}{18}= 0.0128g$ hydrogen

Total weight of sample taken = 0.1005

so mass of oxygen = 0.1005-(0.077+0.0129)=0.0106 g

moles of carbon = mass / atomic mass = 0.077/12=0.00641

moles of hydrogen = mass /atomic mass = 0.0128/1=0.0128

moles of oxygen = mass / atomic mass =0.0106/ 16=0.00066

Let us divide all the moles with the smallest one

moles of carbon = 0.00641 / 0.00066 = 10 (approx)

moles of hydrogen = 0.0128/0.00066 = 20 (approx)

moles of oxygen = 0.00066/0.00066 = 1

Empirical formula of menthol = C₁₀H₂₀O

Empirical mass =10X12 + 20X1 + 16= 156

Which is equal to molar mass hence the empirical formula = molecular formula

5 0

4 years ago