All categories

3 years ago

The molecular formula for caffeine is C8H10N4O2. Which of the following elements is not found in caffeine?

Chemistry

2 answers:

guajiro [1.7K]3 years ago

6 0

What are the answers?
the elements in caffeine are: C, H, N,O

ANTONII [103]3 years ago

5 0

The correct answer is:

b: Heluim

Explanation:

The caffeine contains: carbon , nitrogen , oxygen , hydrogen.

Caffeine is a primary nervous system energizer of the methylxanthine class. It is the world's most universally consumed psychoactive drug. Unlike many other psychoactive elements, it is fair and unlimited in nearly all parts of the world. Caffeine can be arranged as an alkaloid, a term used for substances originated as end results of nitrogen metabolism in some plants.

You might be interested in

if an unknown gas has one third the root mean squarevspeed of H2 at 300 K, what is the molar mass of the gas?

Viefleur [7K]

The molar mass of the gas : 18 x 10⁻³ kg/mol

<h3>Further explanation</h3>

Given

An unknown gas has one third the root mean square speed of H2 at 300 K

Required

the molar mass of the gas

Solution

Average velocities of gases can be expressed as root-mean-square (V rms)

$\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}$

T = temperature, Mm = molar mass of the gas particles , kg/mol

R = gas constant 8,314 J / mol K

v rms An unknown gas = 1/3 v rms H₂

v rms H₂ :

$\tt v_{rms}=\sqrt{\dfrac{3\times 8.314\times 300}{2.10^{-3}} }\\\\v_{rms}=1934.22$

V rms of unknown gas =

$\tt \dfrac{1}{3}\times 1934.22=644.74$

$\tt 644.74^2=\dfrac{3\times 8.314\times 300}{M_{gas}}\\\\M_{gas}=18\times 10^{-3}~kg/mol$

7 0

3 years ago

What is the weight of a 30.0 kg object? 3.0 N 300 N 6.8 N 132 N

andreyandreev [35.5K]

Explanation:

$w \: = mg \\ = 30\:kg \times 10\:ms^{-2}\\=300\:kg\:ms^{-2} \\ = 300\:N$

6 0

3 years ago

Read 2 more answers

Fill in the blanks (Balancing chemical reactions) BRAINLIEST

Artemon [7]

$\huge{ \mathfrak{ \underline{ Answer \: \: ✓ }}}$

The 2 in front of $Na$ in $2Na + Cl_2 \rightarrow 2NaCl$ is Coefficient.

_____________________________

The $_2$ after $Cl_2$ in the same equation is sub script.

_____________________________

There are two atoms of $Na$ in $2NaCl$

_____________________________

$\mathrm{ \#TeeNForeveR}$

7 0

3 years ago

Classify the following as a heterogeneous mixture, homogeneous mixture (solution), or a pure substance: lemonade with no pulp A.

IceJOKER [234]

Answer:

Explanation:

7 0

2 years ago

In the second step of this reaction, isocyanic acid reacts to form melamine and carbon dioxide: hnco(l)→c3n3(nh2)3(l)+co2(g) bal

slava [35]

Formula of isocyanic acid is HNCO. It colourless, volatile compound. It is poisonous inorganic compound. Melamine is synthesized from urea. The reaction involves two steps. In first step, urea gets converted to isocyanic acid which is an intermediate. In the second step, isocyanic acid gives melamine (molecular formula C₃H₆N₆) and carbon dioxide (CO₂). The balanced chemical reaction involved in second step is given below:

6 HNCO → 1 C₃N₃(NH₂)₃ + 3CO₂

The co-efficient of the reaction are: 6, 1, 3

7 0

4 years ago

Read 2 more answers