Chemistry, 03.03.2021 22:00 Theblackdot15
Balanced equation: SiO2 + 4 HF --> SiF4 + 2H2O
Problem: How many moles of HF are needed to produce 12.5 moles of water?
A. 18.5 moles
B. 6.25 moles
C. 25 moles
D. 100 moles
HELP PLEASEE !
Answers: 3
Chemistry, 22.06.2019 01:20
1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.
Answers: 2
Chemistry, 22.06.2019 01:20
Match the acid base pairs by arranging the acid name with the conjugate base formula. hydrogen carbonate hydrogen phosphate carbonic acid read water sulfuric acid phosphoric acid a. co32- b. hso4- c. hco3- d. po43- e. h2po4- f. oh-
Answers: 1
Chemistry, 22.06.2019 02:00
Which of the following happens during cell division? (a) energy is created (b) waste is eliminated (c) carbon dioxide is released (d) damaged cells are replaced
Answers: 1
Balanced equation: SiO2 + 4 HF --> SiF4 + 2H2O
Problem: How many moles of HF are needed to produ...
History, 27.07.2019 03:00
Mathematics, 27.07.2019 03:00
Mathematics, 27.07.2019 03:00
Social Studies, 27.07.2019 03:00
English, 27.07.2019 03:00
Geography, 27.07.2019 03:00
Biology, 27.07.2019 03:00
Biology, 27.07.2019 03:00
Biology, 27.07.2019 03:00
Social Studies, 27.07.2019 03:00