All categories

3 years ago

A compound is made of 49.31% C, 43.79% 0 and the rest hydrogen. The molar

Chemistry

1 answer:

Alexeev081 [22]3 years ago

8 0

Explanation:

49.31 + 43.79 = 93.10

finding the percentage of hydrogen in the compound hence 100-93.10 =6.9

therefore 6.9 percent of hydrogen is present in the compound

assuming that the compound is in 100 g so the elements present would be 49.31g of C , 43.79g of O and 6.9g of H

no. of moles of C = given mass÷molar mass

= 49.31 ÷ 12

=4.11 mol

no of moles of O = givem mass ÷molar mass

=43.79÷ 16

=2.73 mol

no. of moles of H =6.9÷1

=6.9 mol

dividing the no. of moles of each element by the least count of the elemnt to get the ratio of the simple whole numbr

therefore

so by dividing we get 1:1:2 of C:O:H

the empirical formula is CH2O

empirical formula mass of CH2O IS

= (12)+(2×1)+(16)

= 12+2+16

=30 G/MOL

n= molar mass of the compound ÷ empirical formula mass of the compound

so, n= 146.1 ÷30

n=5

molecular formula = n×empirical formula

molecular formula=C5H10O5 (ribose is the compound)

You might be interested in

When two or more refrigerant are mixed what must be done with the mixture

german

Refrigerants are chemical mixtures composed of several substances. During the HVAC cycle, refrigerants can usually exist in several states.
These substances have very dangerous and destructive effects on the environment.

Based on this, if two or mire refrigerants are mixed together, the mixture must be recovered into a separate tank and sent to the specialized facility to destroy it.
The destruction of the mixture should only be done by experts in specialized facilities.

Hope this helps :)

5 0

4 years ago

Read 2 more answers

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25 degrees Celsius over a right a

jolli1 [7]

Answer:

2 atm

Explanation:

Chemical reactions are carried out at a certain rate. Sometimes that rate is quite slow, so we want to speed things up, which is usually used by increasing temperature, increasing pressure or adding a catalyst (a substance that increases the rate without changing itself).

If this is the case, then, when writing a chemical equation, we state these special conditions over a right arrow.

Now let's look at the answers:

- 25°C is a value and unit of temperature

- ∆ is a symbol that denotes change

- 2 atm is a value and unit of pressure (atmosphere is old unit for pressure)

- Pt is a chemical symbol for platinum, an element often used as a catalyst.

So, the correct answer is C) 2 atm

7 0

4 years ago

Read 2 more answers

Part A

astraxan [27]

Answer

mass of 1 mole = 18g

mass of 1 mL = 1g

the unit used is gram

Explanation:

There are two ways to find mass of water:

1st way:

If we find Mass of water for one mole of water:

For this purpose we use mole formula as below

no. of moles = mass in grams / molar mass

if we find mass for one mole of water:

then

no. of moles of water = 1 mol

molar mass of water = H₂O = (1x2 +1x16) = 18 g/mol

mass of water = ?

Put the value in the mole formula

no. of moles = mass in grams / molar mass . . . . . . . . . . . . (1)

by rearranging the formula (1)

mass in grams = no. of moles x molar mass

mass in grams = 1 mole x 18 g/mol

mass in grams = 18 g

So for one mole of water the mass of water is 18 g and the unit for it is gram.

2nd way:

We can find mass of water by another way too

if we find the mass 1 mL of water

then the formula will be used is

D = m/v

where D is density

m is the mass

and v is the volume

density of water for 1 mL (D) = 1 g/ml

volume of water = 1 mL

mass of water = ?

By Rearranging density formula for mass

m = D/v ......................... (2)

put the values in equation 2

m= 1gmL⁻¹ / 1 mL

m= 1g

So the mass of 1mL is 1g

7 0

4 years ago

Cotton and coir are the types of ___________fibres.

vlada-n [284]

Answer:

<h2>natural</h2>

Explanation:

hope this helps you!!

mark as brainliest please

8 0

3 years ago

Read 2 more answers

Programs that award certificate that u can help in securing jobs are called

leonid [27]

vocational or technical education programs.

Explanation:

A vocational or technical education program is one that awards certificate that can help in securing jobs.

In a vocational or technical program, one is studying for a specific job role. It involves and hands on practical processes within a short period of time possible that makes one viable for some roles.

Examples are IT technician, Welders, Carpentry etc

learn more:

Job hazards brainly.com/question/3193019

#learnwithBrainly

7 0

4 years ago