Which of these compounds is likely to have very low solubilityvin water?

Calculate by (a)% weight and (b) %mole each of the elements present in sugar

Musya8 [376]

Explanation:

Molecular mass of sugar = $C_{12}H_{22}O_{11}$ : = 432 g/mol

Atomic mass of carbon atom = 12 g/mol

Atomic mass of hydrogen atom = 1 g/mol

Atomic mass of oxygen atom = 16 g/mol

a) Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100$

Percentage of carbon by weight in $C_{12}H_{22}O_{11}$ :

$\frac{12\times 12 g/mol}{342 g/mol}\times 100=42.10\%$

Percentage of hydrogen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{22\times 1g/mol}{342 g/mol}\times 100=6.43\%$

Percentage of oxygen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{11\times 16g/mol}{342 g/mol}\times 100=51.46\%$

b) Percentage of mole each of the elements present in sugar:

= $\frac{\text{Moles of atoms of an element}}{\text{total moles of all types of atoms}}\times 100$

In mole of sugar we have 12 moles of carbon atom , 22 moles of hydrogen atoms and 11 moles of oxygen atoms.

Percentage of carbon by mole in $C_{12}H_{22}O_{11}$ :

$\frac{12 mol}{45 mol}\times 100=26.66\%$

Percentage of hydrogen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{22 mol}{45 mol}\times 100=48.88\%$

Percentage of oxygen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{11 mol}{45 mol}\times 100=24.44\%$

7 0

4 years ago

A canister of neon contains 4.8x1024 atoms of the gas. How many moles of neon are present in the canister?

algol [13]

Answer:

7.97 moles of neon are present in the canister.

Explanation:

Avogadro's constant or "Avogadro's number" is the number of constituent particles found in the amount of substance in one mole.

In other words, Avogadro's number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

So, you can apply the following rule of three: if 6.023*10²³ atoms are present in 1 mole, 4.8*10²⁴ atoms are present in how many moles?

$amount of moles=\frac{4.8*10^{24}atoms*1 mole }{6.023*10^{23}atoms}$

amount of moles= 7.97 moles

7.97 moles of neon are present in the canister.

4 0

3 years ago

The mass of the products of a chemical reaction will be? greater than the mass of the reactants, the same as the mass of the rea

NeTakaya

This is simple it is proportional.

3 0

3 years ago

3.org bookmarks

ANEK [815]

Answer:

A decrease in temperature decreases the number of collisions between molecules . The reaction rate will decrease

Explanation:

8 0

3 years ago

ANYONE HELP ME IN CHEMISTRY:( JUST THE NAME AND SYMBOL ANYONE WHO CAN HELP ME:(

lana [24]

Answer:

Hydrogen: H, Helium: He, Carbon: C

Nitrogen: N, Oxygen: O, Fluorine: F

Neon: Ne, Sodium: Na, Magnesium: Mg

Aluminum: Al, Silicon: Si, Phosphorus: P

Chlorine: Cl, Selenium: Se, Silver: Ag

Titanium: Ti, Beryllium: Be, Lithium: Li

Uranium: U, Nickel: Ni , Copper: Cu

Bromine: Br, Cadmium: Cd, Zinc: Zn

Cobalt: Co, Gallium: Ga, Germanium: Ge

Iron: Fe, Krypton: Kr, Potassium: K

Calcium: Ca, Chromium: Cr, Manganese: Mn

Scandium: Sc, Tin: Sn, Vanadium: V

Platinum: Pt, Boron: B, Au: Gold

7 0

3 years ago