Question

The number of atoms of oxygen in 27.7 grams of copper sulfate, CuSO₄,is: (molecular weight of CuSO₄ is 160)

(a) 0.173
(b) 0.692
(c) 1.04x10²³
(d) 2.61x10²²
(e) 4.17x10²³





In the oxidation-reduction reaction Sn⁴⁺ + 2 Fe²⁺ → 2 Fe³⁺ + Sn²⁺

a. Sn4⁺ is reduced and Fe2⁺ is oxidized.
b. Sn4⁺ is oxidized and Fe2⁺ is reduced.
c. Sn4⁺ is oxidized and Fe3⁺ is reduced.
d. Fe3⁺ is reduced and Sn2⁺ is oxidized.
e. Fe2⁺ is oxidized and Fe3⁺ is reduced.





The formula of ethanol is C₂H₅ – OH. What will be its molecular mass?

I. 46 u
II. 34 u
III. 34 g
IV. 46 g






Calculate the weight, in grams, of one molecule of carbon dioxide, CO₂. (Atomic wts: C = 12.0, O = 16.0)

(a)44.0
(b)1.37x10²²
(c)7.31x10-²³
(d)4.65x10-²³
(e)1.99x10-²³




Which of the following is a wrong Combination?

I. 6.022 * 10²³ molecules of oxygen = 32g of oxygen
II. 6.022 * 10²³ ions of sodium = 23g of sodium
III. 6.022 * 10²³atoms of C = 24g of carbon
IV. 6.022 * 10²³ atoms of H = 1g of hydrogen atoms




The number of atoms of oxygen in 27.7 grams of copper sulfate, CuSO₄,is: (molecular weight of CuSO₄ is 160)

(a)0.173
(b)0.692
(c)1.04x10²³
(d)2.61x10²²
(e)4.17x10²³





For this reaction, KClO₄ + H₂O₂ → KClO₃ + O₂ + H₂. Choose the true statement from the following list.

a. The Cl oxidation state is reduced form +8 to +6
b. This is not an oxidation-reduction reaction.
c. H₂O₂ caused reduction.
d. Hydrogen is reduced from +2 to +1
e. Potassium is reduced during the reaction








pls answer asap.
correct answers will get brainliest.....
best of luck......​

Answer 1

Answer:

a part is the most correct one