Предмет: Химия, автор: eliannarey666555

1.Знайти масу карбонату кальцію який утворився при взаємодії 4 л оксиду вуглецю з гідроксидом кальцію
2.Обчислити об єм газу, який виділився при взаємодії Al з 0.7 моль сульфатної кислоти
3.Добути всіма можливими способами ортофосфат натрію .

Ответы

Автор ответа: Melissa0607
1

Ответ:

Объяснение:

1. Дано:

n(Ca(OH)2) = 4моль

-----------------------------

m(CaCO3)-?

Решение:

Сa(OH)2 + CO2 = CaCO3 + H2O

Определяем количество вещества карбоната кальция. По уравнению реакции

n(CaCO3) = n(Ca(OH)2) = 4моль

m(CaCO3) = n x M = 4моль х 100г/моль = 400г

2. (Просто подставь 0,7)Дано:

n (HCl) = 1/2 моль = 0,5 моль

Знайти:

V (газу) — ?

Розв’язання:

2Al + 6HCl → 2AlCl3 + 3H2

Складемо пропорцію:

0,5 / 2 = X / 3 × 22,4

0,5 / 2 = X / 67,2

X = 0,5 × 67,2 / 2 = 16,8 л

Відповідь: V (газу; HCl) = 16,8 л.

3.  1)6Na +2 H3PO4 =2 Na3PO4 +3 H2  - реакция взаимодействия натрия с ортофосфорной кислотой

2) 3NaOH + H3PO4= Na3PO4 + 3H2O  взаимодействие гидроксида натрия с ортофосфорной кислотой

3) 6NaOH + Р2О5=2 Na3PO4 + 3H2O взаимодействие оксида фосфора с гидроксидом натрия

4) 3Na2СО3 + 2H3PO4 = 2Na3PO4 + 3H2O +3СО2

Интересные вопросы
Предмет: Английский язык, автор: Аноним
помогите...пожалуйста  
  Поставьте прилагательные в скобках, в правильной форме.  
In the middle of the 18th centyry some of the 1(FASHIONABLE) rich yong men in.Britain copied the 2(LATE) Italian fashions. They wore extavagant clothes lost of make-up to look pale and high wigs that were powdered and tied with ribbons.
Fashion Through the Ages In the middle of the 18th century, some of the (3)(fashionable) rich young men in Britain copied the (4)(late) Italian fashions. They wore extravagant clothes, lots of make up to look pale, and high wigs that were powdered and tied with ribbons.In Europe at the end of the 18th century, women’s dresses began to get (5)(wide) and their hair began to get (6)(long). The (7)(wide) dresses measured nearly two metres, making it difficult to move around and sit down. To make themselves (8)(pretty), some women had enormous hairstyles. These were often decorated with flowers, feathers and even fruit!After the First World War, the clothes of the swinging 1929s shocked many people. Fashions for women became (9)(relaxed) and (10) (free) than before. Their hair became much (11)(short) and dresses were not as (12)(long) and (13)(wide) as before. Their clothes became (14)(bright) and (15)(little) formal, to match the new music and dances like the Charleston.
Punk fashions were as (16)(aggressive) as punk music, which arrived in the 1970s. Punks chose the (17)(little) conventional hairstyles possible. They cut their hair in strange ways and often dyed it bright colours. They usually wore large boots, torn jeans and painted leather jackets.
Предмет: Русский язык, автор: 070504dima
Предмет: Литература, автор: эльза1210