1)определить массу hbr, если количество вешества hbr равно 4 моль. 2)определить количество молекул в 3, 5 молях h2s. 3)определить количество вещества в 100 г. н2о.

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Объяснение:

Значит смотри для начала определим заряд общий всего комплекса, он будет противоположен по знаку общему заряду двух атомов брома. зная, что бром, в брлмидах, проявляет степень окисления -1, найдём, что у брома общий заряд тут будет: 2*-1=-2, значит у комплекса [Pt(NH3)4Cl2] общий заряд будет +2, далее, мы знаем что обычно хлор проявляет степень окисления -1, азот в аммиаке с.о имеет -3 а водород +1 значит что сумма степеней окисления всех веществ кроме платины в данном комплексе будет: -1*2+(-3)*4+1*3*4=-2, а нам надо добиться того, чтоб данный комплекс имел заряд +2, значит, соответственно у платины степень окисления должна быть +4, т.к -2+4=+2, вот и все впринципе.

Вопросы заданы по тексту
Shogan Ualikhanov was born in November in 1835.He was a Kazakh scientist,ethnographer and a historian.Shogan spent his childhood in his father's traditional yurt.His father sent him to a small private school in 1842 when he was six.He moved to grandmother's home. Ualikhanov entered the milltary academy in Omsk in 1847. He read a lot of books in Russia. He travelled in Central Asia in the late 1850s. In 1856 he went to the region of Issyk Kul where he had his first successful expedition. In 1857 he went to Russia to report about the result of the expedition and there he became the member of the Russian Geographical Society. On June 28,1858, Shogan Ualikhanov began his second expedition. He had a caravan of 43 men,101 camels and 65 horses. The caravan arrived in Kazakhgar in early October of 1858. During his travels he collected a lot of materials about traditions and customs of the people in the places he visited. He returned to his native steppe region because he became seriously ill in the spring of 1861.He died on April 10,1865 at the age of 29.His works are still popular.
1. When was he born?
2. When did he go to school?
3. Where did he go to school?
4. Where did he go first to have his expedition?