Answer:
please give me brainlist and follow
Explanation:
Substance in water + 3 mL Benedict's solution, then boil for few minutes and allow to cool. The common disaccharides lactose and maltose are directly detected by Benedict's reagent because each contains a glucose with a free reducing aldehyde moiety after isomerization.
Moles of SF6 = 0.15/molar mass of SF6 = 0.15/146.06 = 1.02 x 10⁻³ moles.
Moles of NH3 = Moles of SF6 = 1.02 x 10⁻³ moles.
Therefore mass of NH3 = moles of NH3 x molar mass of NH3
= 1.02 x 10⁻³ x 17.03
= 0.017 grams.
Its atomic radius increases because there is less electron shielding after the sodium loses one e-. Sodium is a nonmetal which means it forms an anion. Anions always increase from their original atomic radius
The mass of Au is 19.7 g
The chemical reaction may be
Au₂S₃ + 3H₂ → 2Au + 3H₂S
1 mole of Au₂S₃ gives 2 mole of Au
Then 0.0500 mol of Au₂S₃ gives
0.0500 × 2 / 1
= 0.10 moles.
To find mass
Mass = moles × molar mass
Moles = 0.10.
Molar mass = 197 g
Mass = 0.10 × 197
= 19.7 g
Hence the mass of Au produces is 19.7 g
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Answer:
605.4 J
Explanation:
When a certain substance absorbs a certain amount of energy, its temperature increases according to the equation:
where
Q is the heat absorbed
m is the mass of the substance
C is the specific heat capacity of the substance
is the change in temperature
In this problem, we have:
m = 15.5 g is the mass of the piece of aluminium
C = 0.902 J/g⁰C is the specific heat of the aluminium
is the change in temperature of the aluminium (in fact, at thermal equilibrium, the block of aluminium reaches the same final temperature as the coffee)
Therefore, the energy absorbed is
