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An hourly energy requirement of an astro...

An hourly energy requirement of an astronaut can be satisfied by the energy released when 34 grams of sucrose (`C_(12)H_(22)O_(11)`) are burnt in his body. How many grams of oxygen would he need to be carried in space capsule to meet his requirement for one day ?

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To solve the problem of how many grams of oxygen an astronaut would need to carry in a space capsule to meet his energy requirement for one day, we can follow these steps: ### Step 1: Write the balanced chemical equation for the combustion of sucrose. The combustion of sucrose (C₁₂H₂₂O₁₁) in the presence of oxygen (O₂) produces carbon dioxide (CO₂) and water (H₂O). The balanced equation is: \[ C_{12}H_{22}O_{11} + 12 O_2 \rightarrow 12 CO_2 + 11 H_2O \] ### Step 2: Calculate the number of moles of sucrose in 34 grams. ...
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How many atoms are contained in one mole of sucrose (C_(12)H_(22)O_(11) )?

The heat of combustion of sucrose (C_(12)H_(22)O_(11)) is 1350 kcal//mol . How much of heat will be liberated when 17.1 g of sucrose is burnt ?

The heat of combustion of sucrose (C_12H_22O_11) is 1350 kcal/mol. How much of heat will be liberated when 161 g of sucrose is burnt ?

(a) A solution is prepared by dissolving 10g of non-volatile solute in 180g of H_(2)O . If the relative lowering of vapour pressure is 0.005 , find the molar mass of the solute. (b) How many grams of sucrose (C_(12)H_(22)O_(11)) must be dissolved in 90g of water to produce a solution over which the relative humidity is 80% ? Assume the solution is ideal.

The commercial production of water gas utilizes the reaction under standard conditions :C+H_(2)O_((g)) rarr H_(2)+CO . The heat required for this endothermic reaction may be supplied by adding a limited amount of air and burning some carbon to CO_(20 . How many gram of carbon must be burnt to CO_(2) to provide enough heat for the water gas conversion of 100g carbon ? Neglect all heat losses to the environment. Also DeltaH_(f)^(@) of CO,H_(2)O_((g)) and CO_(2) are -110.53, -241.81 and -393.51kJ //mol respectively.

A person inhales 640g of O_(2) per day. If all the O_(2) is used for converting sugar into CO_(2) and H_(2)O , how much sucrose (C_(12)H_(22)O_(11)) is consumed in the body in one day and what is the heat evolved ? (DeltaH_("combination of sucrose ")=-5645kJ mol^(-1))

An athelete is given 100g of glucose (C_(6)H_(12)O_(6)) of energy equivalent to 1560 kJ . He utilises 50% of this gained enegry in the event. In order to avoid storage of enegry in the body, calculate the weight of water he would need to perspire. The enthalpy of evaporation of water is 441kJ//mol .

Photosynthesis is a bio process by which plants make energy rich molecules from low energy molecules with the help of energy from sunlight . The photosynthesis of glucose can be represented as: 6CO_(2(g))+ 6H_(2)O_(g) + hv rarr C_(5)H_(12)O_(6(s)) + 6O_(2)(g)..........(i) The energy of one mole of a photon of wave lenght is known as one Einstein. A weight lifter lifts a weight of 160Kg through of 2.4 m . Assuming all the energy required for this task is obtained by the combustion of glucose , calculate the change in the current produced by a sample of blood of the weight lifter . Same volume of blood (5mL) is tested both before and after lifting the weight and the total volume of blood in his body is 5L. (1 g of glucose releases 15.58 KJ of energy )

An athlete is given 180 g of glucose (C_(6)H_(12)O_(6)) . He utilises 50% of the energy due to internal combustion in the body. In order to avoid storage of energy in the body, calculate the masss of water he would need to perspire. Given enthalpy of combustion of glucose is -2800 kJ mol^(-1) and enthalpy of evaporation of water is 44 kJ mol^(-1)

An athlete is given 180 g of glucose (C_(6)H_(12)O_(6)) . He utilises 50% of the energy due to internal combustion in the body. In order to avoid storage of energy in the body, calculate the masss of water he would need to perspire. Given enthalpy of combustion of glucose is -2800 kJ mol^(-1) and enthalpy of evaporation of water is 44 kJ mol^(-1)

ICSE-SOME BASIC CONCEPTS OF CHEMISTRY -NCERT TEXT-BOOK EXERCISES (WITH HINGS AND SOLUTIONS)
  1. An hourly energy requirement of an astronaut can be satisfied by the e...

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  2. Calculate the molar mass of the following: (i) H(2)O (ii) CO(2) (i...

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  3. Calculate the mass per cent of different elements present in sodium su...

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  4. Determine the empirical formula of an oxide of iron, which has 69.9% i...

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  5. Calculate the amount of carbon dioxide that could be produced when ...

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  6. Calculate the mass of sodium acetate (CH3COONa) required to make 500 m...

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  7. Calculate the concentration of nitric acid in moles per litre in a sam...

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  8. How much copper can be obtained from 100 g of copper sulphate (CuSO(4)...

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  9. Determine the molecular formula of an oxide of iron in which the mass ...

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  10. Calculate the atomic mass (average) of chlorine using the following da...

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  11. In three moles of ethane (C(2)H(6)), calculate the following: (i) N...

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  12. What is the concentration of sugar (C(12)H(22)O(11)) in mol L^(–1) if ...

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  13. If the density of methanol is 0.793 kg L^(–1), what is its volume need...

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  14. Pressure is determined as force per unit area of the surface. The SI u...

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  15. What is the SI unit of mass? How is it defined?

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  16. Match the following prefixes with their multiples:

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  17. What do you mean by significant figures?

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  18. A sample of drinking water was found to be severely contaminated with ...

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  19. Express the following in the scientific notation: (i) 0.0048 (ii) 2...

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  20. How many significant figures are present in the following? (i) 0.002...

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  21. Round up the following upto three significant figures: (i) 34.216 ...

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