07/01/19

How many drops total in 3ml
in general there are 15 to 20 drops per ml . For PTCB calculations use 20 drops/ ml. Set up equation as such.20 drops/mL = x drops / 3 mL . Solve for x to get the answer, which is 60 drops.
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06/29/19

van't_Hoff_general_solution
A solution of cane sugar ( molar mass is 342g per mole) containing 17.8g per L has an osmotic presssure 1.2 atm . Calculate the temperature of the soultion .( where R= 0.082L atm per mol per K). ... more
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06/28/19

colligative properties
calculate the freezing point of solution perpared by dissolving 4.5g of gulcose ( m.mass = 180g per mol) in 250 g of bromo form . Given freezing point of bromo form = 7.8°C and Kf for bromo form =... more
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06/27/19

Can parts of a human brain be asleep independently of each other, or vary in the times required for them to fall asleep?
I know that some birds and marine animals can continue complicated activity (swimming, flying?) while one hemisphere of their brain is asleep.I'm interested if human brain has some parts of it that... more
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06/27/19

Which particle make up the nucleus of an atom?
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06/27/19

homeworkkkkkkkk
the overall reaction in a commercial heat pack can be represented as:4Fe(s)+3O2(g) --> 2Fe2O3(s) delta H= -1652kJa)How much is relased when 4.00 moles of ron are reacted with excess O2? ... more
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06/27/19

please help with my chemistry thank you in advance :)
a swimming pool, 10.0m by 4.0m, if filled with water to a depth of 3.0m at a temperature of 20.2 degree C. How much energy is required to raise the temperature of the water to 24.3 degrees C... more
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06/27/19

chemistry homework :(
a balloon is filled to a volume of 6.65x10^2 mL at a temperature of 23.0°C. The balloon is then cooled at a constant pressure to a temperature of 1.36x10^2 K. What is the final volume of the... more
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06/26/19

What is the osmotic pressure of a solution made by dissolving 85.0 g of glucose, C6H12O6, in enough water to form 525.0 mL of solution at 25.0 ∘C ?
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06/26/19

Please help me in my chem ;(
The specific heat capacity of silver is 0.24 J/°C·g.A. Calculate the energy required to raise the temperature of 154.0 g  from 268 K to 292 K.Energy = _____  JB. Calculate the energy required to... more
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06/26/19

I NEED HELP IN CHEMISTRY PLS
The overall reaction in a commercial heat pack can be represented as4Fe(s) + 3O2(g)---> 2Fe2O3(s) (delta)H + -1652kJA. How much heat is released when 4.20 moles of iron are reacted with... more
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06/26/19

Chemistry Homework
A gas sample contains 1.44 moles at 21° C exerts a pressure of 300. torr. Some gas is added to the same container and the temperature is increased by 40° C. If the pressure increases to 750 torr,... more
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06/26/19

A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°C. If the energy needed to raise the temperature of the water to 28.1°C is obtained from the

combustion of methane (CH4),what volume of methane, measured at STP, must be burned? ∆H for CH4 = -891 kJ/mol
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06/26/19

A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°C. How much energy is required to raise the temperature of the water to 28.1°C?

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06/26/19

chemistry homework:))
a balloon is filled to a volume of 6.65x10^2 mL at a temperature of 23.0°C. The balloon is then cooled at a constant pressure to a temperature of 1.36x10^2 K. What is the final volume of the... more
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06/26/19

Enthalpy Change
What is the enthalpy change (in kJ) for the reaction of 350.0 mL of a 0.480 M NaOHsolution with 275 mL of a 0.360 M H2SO4 solution? (7)2 NaOH(aq) + H2SO4(aq) ® Na2SO4(aq) + 2 H2O(l) Hrxn = –112... more
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06/26/19

Specific Heat Capacity
If the temperature of a 95.0 g metal block increased from –10.0 °C to 42.7 °C on absorbing 923 J of heat, then what is the specific heat capacity of the metal? What is the heat capacity of the... more
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06/26/19

Electron Configurations

Answer the following questions about the electron configuration given below.↑ ↓ ↑ ↑ ↓ ↑ ↓ ↑ ↓___ ____ ___ ___ ___1s 2s 2pWhat element can have this... more
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06/24/19

how many moles of PbCl2 are produced if 14 moles of AlCl3 are consumed
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06/24/19

Calculate the formula mass of each compound. Keep at least one decimal place
Calculate the formula mass of each compound. Keep at least one decimal place in atomic masses from the periodic table.MgCl2
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06/23/19

2 N2 (g) + 3 H2 (g) → 2 NH3 (g) How many moles of NH3 are produced if 21 mol of N2 reacts?

I'm so frustrated and I do not get how to do these problems. PLEASE HELP ME
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06/23/19

General Chemistry

a student carried out the reaction below starting with 1.993 of unknown, and found that the mass loss due to CO2 was 0.593. how many moles of X2CO3 were consumed?
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06/23/19

What is the difference between "Bisphosphate" and "Diphosphate" in biochemistry?
I have often found bisphosphate compounds ( e.g. RuBP, RuBisCO, 2,3-BPGA etc.) and diphosphate compounds (e.g. ADP, GDP etc.) in biochemistry. They are commonly seen and are important compounds in... more
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06/23/19

You need a 15% alcohol solution. On hand, you have a 240 ml of a 10% alcohol mixture. You also have 35% alcohol mixture. How much of the 35% mixture will you need to add to obtain the desired solution
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06/23/19

N2g+3H2g=2NH3g , what is the maximum mass that can be produced from a mixture of 2.00×10'3g ,N2 and 8.00×10'4g ,H2
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