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3 years ago

1. The underlined portion of the chemical formula above is the _ and it represents ________________.

Chemistry

2 answers:

Mnenie [13.5K]3 years ago

3 0

1.Subscript,how many hydrogen molecules there are

2.No it is not balanced,oxygen is less than represented.

Allushta [10]3 years ago

3 0

1. The correct answer is B. Subscript; how many hydrogen molecules which are there in that one molecule.

Chemical formula above is a superscript and it represents hydrogen molecules in one molecule.

2. The correct answer is C. No, the equation is not balanced. In the equation the oxygen it has less atoms which represents the products.

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What is the PH of a solution with (H+) = 7.0 * 10^-12? A. 11.15 B. -11.15 C. 12.85 D -12.00

larisa [96]

Answer: A. 11.15

Explanation:

The pH of a solution is given by the formular; pH = -log [H+].

pH = - log [ 7.0 x 10 ∧-12]

= 12 - log 7

= 12 - 0.845

= 11.15

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An agronomist hypothesized that add ran intots

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Explanation:

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Which statement describes this reaction?

slamgirl [31]

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3 years ago

The compound adrenaline contains 56.7 % c, 6.56 % h, 28.37% o and 8.28 % n by mass. what is the empirical formula for adrenaline

-Dominant- [34]

Answer:- An empirical formula of adrenaline is $C_8H_1_1O_3N$ .

Solution:- Convert given percentages to moles and then calculate the mol ratio to get the simplest whole number ratio of moles of atoms which is the empirical formula of the compound.

$C=\frac{56.7}{12}$ = 4.725 mol

$H=\frac{6.56}{1}$ = 6.56 mol

$O=\frac{28.37}{16}$ = 1.773 mol

$N=\frac{8.28}{14}$ = 0.591 mol

let's calculate the mol ratio now. To calculate the mole ratio, we divide the moles of each by moleso f N as it's the least one:

$C=\frac{4.725}{0.591}$ = 8

$H=\frac{6.56}{0.591}$ = 11

$O=\frac{1.773}{0.591}$ = 3

$N=\frac{0.591}{0.591}$ = 1

So, an empirical formula of adrenaline is $C_8H_1_1O_3N$ .

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3 years ago

a metal weighing 50.0g absorbs 20.0j of heat when its temperature increases by 150.0°c . what is the specific heat of the metal

nadezda [96]

Answer:

2.677 J/g°C

Explanation:

Quantity of heat required to raise the temperature of the metal,

Q = mc∆T

where m is the mass of the metal, c is the metal's specific heat capacity, and ∆T is the change in temperature that accompanies the heat transfer process

20.0J = 50.0g × c × 150°C

c = 20.0J/(50.0g × 150°C)

c = 2.677 J/g°C

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3 years ago

1. The underlined portion of the chemical formula above is the _____ and it represents ____________________.

1. The underlined portion of the chemical formula above is the _ and it represents ________________.