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Tju [1.3M]
2 years ago
14

Впишите формулы веществ в соответствующие колонки формулы оксидов Выберите из перечня Оксиды :N2O, CuO, V2O5, CO, Mno, CO0, Rb20

, N2O3​
Chemistry
1 answer:
zzz [600]2 years ago
8 0

Answer:  

D. N₂O

Explanation:

Давайте предположим, что у нас есть 100 г соединения. Это означает, что он состоит из 63,61 г азота и 36,69 г кислорода.

Преобразование массы в родинки:

63,61 г N × (1 моль N / 14,01 г N) = 4,540 моль N

36,69 г O × (1 моль O / 16,00 г O) = 2,293 моль O

Нормализовать путем деления на наименьшее:

4,540 / 2,293 = 1,980 моль N

2,293 / 2,293 = 1000 моль O

Так что атомов N примерно в два раза больше, чем атомов O. Следовательно, эмпирическая формула N₂O.

Узнайте больше на Brainly.com - brainly.com/question/13013246#readmore

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ExtremeBDS [4]
The first step is to calculate the molarity of each compound:
final volume of solution = 157 + 139 = 296 mL
molarity of <span>nac2h3o2 = (157 x 0.35) / 296 = 0.1856 molar
molarity of </span><span>hc2h3o2 = (139 x 0.46) / 296 = 0.216 molar

Then, we calculate the pH as follows:
pKa of acetic acid = -log(</span><span>1.75 × 10^-5) = 4.7569
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6 0
2 years ago
Aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 276 mL .
garri49 [273]
Mass = ?

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Volume = 276 mL

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5 0
2 years ago
Pure platinum is too soft to be used in jewelry because it scratches easily. To increase the hardness so that it can be used in
Zina [86]

Answer:

percentage mass of platinum in the alloy ≈ 90.60 %

Explanation:

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The chemical reaction can be represented as follows:

Co (s) + HNO₃ (aq) → Co(NO₃)₂ (aq) +  NO₂ (l) + H₂O (l)

The balanced equation

Co (s) + 4HNO₃ (aq) → Co(NO₃)₂(aq) + 2NO₂ (l) + 2H₂O (l)

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atomic mass of cobalt = 58.933 g/mol

Molar mass of Co(NO₃)₂ = 58.933 + 14 × 2 + 16 × 6 = 58.933 + 28 + 96 = 182.933  g

58.933 g of cobalt produce 182.933  g of  Co(NO₃)₂

? gram of cobalt will produce 2.49 g of Co(NO₃)₂

cross multiply

grams of cobalt that will react = (58.933 × 2.49)/182.933

grams of cobalt that will react = 146.74317000/182.933

grams of cobalt that will react= 0.8021689362 g

grams of cobalt that will react = 0.802 g

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percentage mass of platinum in the alloy ≈ 90.60 %

6 0
2 years ago
A sample of ammonia gas at 75°c and 445 mm hg has a volume of 16.0 l. what volume will it occupy if the pressure rises to 1225 m
ioda
In this kind of exercises, you should  use the "ideal gas" rules: PV = nRT
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V should be in cubic meter:
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7 0
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kupik [55]
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C = molar heat capacity
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ΔS = 19.8 J/K + (-16.9 J/K)
ΔS = 2.9 J/K

The entropy change for combining the two temperatures of water is 2.9 J/K.
3 0
2 years ago
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