Benzene has the molar mass of 78. It is known that its empirical formula is CH. Find benzene's molecular formula.
CH
C4H4
C6H6
C6H8
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K
Khách
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4 tháng 1 2020
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The sun's corona is almost as hot as interior. Solar prominences-tongues of hot gas-leap outward a half million miles from the sun's surface at speeds reaching 250,000 miles an hour. ........Fortunately... (fortune) , these prominences do not travel the full ninety three million miles to earth, nor are their terrific temperatures transmitted through space. Some of the energy from these ..disturbances ....... (urban) does not reach our atmosphere, however, and is believed to cause changes in weather.Our sun is actually an orange, dwarf star. Although it is not nearly the hottest star known, its surface temperature is about 10,000'F and that of its interior is thought to be in the range of 20,000,000'F. We commonly think of the sun as burning, yet it's too hot to burn and is composed of elemental gases.
The sun is 865,000 miles in diameter and has a mass one-third of a million times greater than the Earth's. Scientists believe that it's two billion years old and, instead of cooling, is still getting hotter. Perhaps, within the next two billion years, it will reach a temperature of sufficient intensity to destroy the Earth.
KL
4 tháng 1 2020
Our sun is actually an orange, dwarf star. Although it is not nearly the hottest star known, its surface temperature is about 10,000'F and that of its interior is thought to be in the range of 20,000,000'F. We commonly think of the sun as burning, yet it's too hot to burn and is composed of elemental gases.
The sun is 865,000 miles in diameter and has a mass one-third of a million times greater than the Earth's. Scientists believe that it's two billion years old and, instead of cooling, is still getting hotter. Perhaps, within the next two billion years, it will reach a temperature of sufficient intensity to destroy the Earth.
The sun's corona is almost as hot as interior. Solar prominences-tongues of hot gas-leap outward a half million miles from the sun's surface at speeds reaching 250,000 miles an hour. Fortunately, these prominences do not travel the full ninety three million miles to earth, nor are their terrific temperatures transmitted through space. Some of the energy from these disurbances does not reach our atmosphere, however, and is believed to cause changes in weather.Our sun is actually an orange, dwarf star. Although it is not nearly the hottest star known, its surface temperature is about 10,000'F and that of its interior is thought to be in the range of 20,000,000'F. We commonly think of the sun as burning, yet it's too hot to burn and is composed of elemental gases.
The sun is 865,000 miles in diameter and has a mass one-third of a million times greater than the Earth's. Scientists believe that it's two billion years old and, instead of cooling, is still getting hotter. Perhaps, within the next two billion years, it will reach a temperature of sufficient intensity to destroy the Earth
31 tháng 1 2017
Đáp án: B
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Dịch: Nó được biết đến với độ tin cậy của nó bởi vì nó hiếm khi thất bại trong suốt vòng đời dài của nó.
23 tháng 5 2017
Đáp án: A
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Dịch: Đồng hồ, được thiết kế bởi Edmund Beckett Denison, có độ chính xác vượt trội.
3 tháng 6 2017
Đáp án: A
Giải thích: Thông tin: It is one of London's most famous landmarks.
Dịch: Đây là một trong những địa danh nổi tiếng nhất của London.
28 tháng 2 2020
A team of DESIGNER from Warwick University have recently launched a Formula 3 racing car with a DIFFERENCE. With a top speed of 232kph, the ecoF3 is powered by chocolate contains a steering wheel made from corrots, a seat made from soya beans and its bodywork consists of various PRODUCT including potatoes and RECYCLE bottles.
A University spokesperson said the INTENDER was to design something "fast, fun and exciting". The result is a car whose PERFORMANCE is as good as any car made from more traditional materials and the designers are delighted with this ACHIEVEMENT. However, the car's engine does not currently meet Formula 3 REGULATION because of its UNUSUAL fuel. "The fact is that an environmentally friendly car is not NECESS a slow car", said the spokesperson, and it is hoped that racing chiefs will recognise this and change the rules so that the ecoF3 can complete in the Formula 3 CHAMPIONSHIP next season.
\(M_{CH}=12+4=16(loại)\\ M_{C_4H_4}=12.4+4=52(loại)\\ M_{C_6H_6}=12.6+6=78(nhận)\\ M_{C_6H_8}=12.6+8=80(loại)\)
Vậy chọn \(C_6H_6\)
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