Предмет: Химия, автор: Ksuisha

Найти массу фосфора которая содержит в оксиде фосфора массой= 28,4 г.

Ответы

Автор ответа: lena3096

2

28.4г 180 г

P4O10 +6 H2O =4 H3PO4

284г 6*18г

М(Р4О10)=284г/моль

М(Н2О)=18г/моль

n(P4O10)=28.4/284=0.1 моль

n(H2O)=180/6*18=1.7 моль

вода в избытке!!!!

находим массу отрофосфорной кислоты по оксиду фосфора

28.4г х грамм

P4O10 +6 H2O >> 4 H3PO4

284 гр 4*98грамм

M(H3PO4)=98г/моль

m(H3PO4)=28.4*(4*98)/284=39.2 грамма

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: Twinsister11

перевод не нужен!
Paraphrase the, following sentences according to the model. Translate them into Russian.

Model He left the room and did not say a word.

He left the room without saying a word.

1. My sister turned away and did not answer my question. 2. They left very early. They did not wake anybody up. 3. He did not lose a minute. He sat down to work at once. 4. The fast train passed the smaller stations and did not stop. 5. He asked question after question and did not wait for an answer. 6. The man sat in front of the TV but did not watch it. 7. She went into her room and sat down in (to) an armchair. She did not turn on the lights. 8. When they moved to another place they did not leave their new address. 9. He never makes a single mistake when he speaks English. 10. He did the job alone. He did not turn to anybody for help or advice.

1 год назад

Предмет: Английский язык, автор: Hetter

Jon Bennett used to be a hotel 1_________(manage) but now he has one of the most unusual
jobs in Britain. Every day since he left the hotel, Jon’s job has been to climb Helvellyn, a
mountain in the Lake District, and check the weather conditions at the summit. The
2____________ (inform) which he gathers is then passed to the Lake District telephone
Weatherline service. The Weatherline has been in 3___________ (operate) for 33 years and is
used by nearly half a million 4_________(walk) every year. They have come to rely on it to check
that it is safe before setting off up the mountain. Although Helvellyn is only 950 metres tall,
weather conditions at the summit can
change 5___________(rapid), and every year the mountain claims the lives of a number of
6______(visit). During his 7__________(child), Jon lived in Buckinghamshire, in the south of
England, but he 8_________(regular) visited the Lake District on family holidays and fell in love
with the 9___________(beauty) landscape. He studied catering at college and took the first
opportunity to move north and find a job in a hotel in the area. When he saw the
10__________(advertise) for the job with Weatherline, he jumped at the opportunity, and couldn’t
believe his luck when they told him he’d got the job. “I still can’t believe it,” he says. “It’s a dream
come true!”

1 год назад

Предмет: Английский язык, автор: 1234fghh

текст на английском с переводом на тему болезнь 10 предложений

1 год назад

Предмет: Математика, автор: lemuro4kaovt2gn

a) Xn+1=2Xn+1 x1=-5

b) Xn+1= 3Xn+Xn-1 +2 X1=1 X2= 2

7 лет назад

Предмет: Математика, автор: kadesya

Первый мастер изготавливает юрту за 20 дней, второй - за 12 дней, а третий - за 15 дней. За сколько дней три мастера изготовят юрту при совместной работе?

7 лет назад