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Y_Kistochka [10]
3 years ago
10

What is cell wall? Where is it found?​

Chemistry
2 answers:
Lady_Fox [76]3 years ago
3 0

Answer:

A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection. They are found in bacteria, archaea, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls.

Explanation:

Lera25 [3.4K]3 years ago
3 0

Answer:

ur answer (◕ᴗ◕✿)(◍•ᴗ•◍)◉‿◉。◕‿◕。(. ❛ ᴗ ❛.)

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Please help me thank you.
Semmy [17]
I will show you with detailed work for NaCl, but follow the same procedure for the rest of the compounds.

Molar Mass - Find the molar mass of the Na and the Cl and add them together
Na - 23
Cl - 35.5
Add those numbers together 23 + 35.5 = 58.5 g/mol

Moles in 1 tsp:
The mass measured in 1tsp of NaCl was 18 g.  To calculate the amount of moles you take the mass measured and divide it by the molecular weight.
18/58.5 = 0.3077 mol

Moles of each element:
To find the moles each element in the compound you multiply the moles of 1 tsp by the number of atoms of the element in the compound
Na - 1 in NaCl
Cl - 1 in Na Cl
so take 0.3077 * 1 = 0.3077 moles Na (and Cl in this case)

Atoms of each:
take the number of moles calculated and multiply that by Avogadro's number(6.023x10^23) for the number of molecules
So for both Na and Cl:
0.3077 * 6.023x10^23 = 1.853x10^23 atoms for both Na and Cl
7 0
4 years ago
Write a balanced formation equation at standard conditions for the compound HCN.
Aloiza [94]
The formation of hydrogen cyanide, HCN is formed by reacting hydrogen gas, carbon and nitrogen gas, expressed in the following expression below:

<span>½ H2 (g) + C (s) + ½ N2 (g) → HCN (g) ΔHof = 135 kJ
</span>
At standard conditions, hydrogen and nitrogen exist as gases while carbon is solid. This is also an endothermic reaction due to the positive <span>ΔHof</span>
7 0
3 years ago
Read 2 more answers
A chemist is given a sample of the CuSO4 hydrate and asked to determine its the empirical formula. The original sample weighed 4
Firlakuza [10]

Answer: The formula for this hydrate is CuSO_4.5H_2O

Explanation:

Decomposition of hydrated copper sulphate is given by:

CuSO_4.xH_2O\rightarrow CuSO_4+xH_2O

Molar mass of CuSO_4 = 160 g/mol

According to stoichiometry:

(160+18x) g of CuSO_4.xH_2O decomposes to give 160 g of anhydrous CuSO_4

Thus 42.75  g of CuSO_4.xH_2O decomposes to give=\frac{160}{160+18x}\times 42.75g of anhydrous CuSO_4

\frac{160}{160+18x}\times 42.75=27.38

x=5

Thus the formula for this hydrate is CuSO_4.5H_2O

8 0
3 years ago
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
inysia [295]
K ---> 38.7 g / 39.1 g/mol = 0.99
N ---> 13.9 g / 14.0 g/mol = 0.99
O ---> 47.4 g / 16.0 g/mol = 2.96

Divide by smallest:

K ---> 0.99 / 0.99 = 1
N ---> 0.99 / 0.99 = 1
O ---> 2.96 / 0.99 = 3

KNO3
8 0
4 years ago
Which best describes a compound such as magnesium oxide?
KatRina [158]
<span>magnesium oxide is a compound that is composed of one atom of magnesium and two atoms of oxygen. The compound is a combination of Mg2+ ion and O2-. The ions translate into atoms which reflects on the subscripst of the elements already. magnesium oxide is a basic oxide with the pH level greater than 7.</span>
4 0
3 years ago
Read 2 more answers
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