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On complete combustion in air, a sample of an unknown hydrocarbon yielded 176 grams of CO2 and 108 grams of H2O with no additional products. Which one of the following might be the formula of the hydrocarbon? (Relative atomic masses: H=1, C =12, O =16)

a) CH 2 b) CH 3 c) CH 4 d) C 2 H 4 e) C 2 H 8 The equation for the combustion of the hydrocarbon is: C x H y + (A + 0.5B)O 2 --> A.CO 2 + B.H 2 OMoles = mass/A r Moles of CO 2 = 176/44 = 4 = AMoles of H 2...
ZC
4118 Views

How should I tackle a text I haven't seen before?

To analyse a text you haven't seen before, begin by carefully reading it through in order to get a sense for what kind of text it is and the main topic(s) it is about. Look for any clues that you are given a...
MS
4281 Views

Give two reasons why an organism might gain a fitness benefit from helping their conspecifics.

Kin selection / Inclusive fitness - if the helper and receiver are related, then they share some of their genes. By helping a relative, you are increasing the likelihood of them passing on their genes, some ...
GP
Answered by George P. • Zoology tutor
1116 Views

There are 700 students in a high school. 10% of them play team sports. 36 students play football, and 22 students play both football and basketball. When choosing one student from the school, what is the probability of them playing basketball only?

We know that 10% play team sports, that means 700*0.1=70 students play team sports. Out of those 70, 36 students play football, 22 play both sports, that means 36-22=14 play football only. Let's draw a diagr...
DT
Answered by Dorottya T. • Maths tutor
3411 Views

Explain the role of auxins in the control of phototropism

A phototropism is the growth of a plant in response to light. This is mediated by auxins such as IAA (Indoleacetic acid). This is released in the tips and shoots of flowering plants. In response to light IAA...
FT
Answered by Florence T. • Biology tutor
6566 Views