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Questions (10)
If the theoretical yield of PbCl2 is 16.547g from the reaction of 7.000g of NaCl with 50.400g of Pb(NO3)2. Calculate the % yield
1 answer
160 views
A special gas mixture is used in bacterial growth chambers which contains 5.00% by mass of CO2 and 95.0% O2. If the mole
3 answers
199 views
Four benefits of youth participation in community anti substance abuse campaigns
10 answers
17,773 views
The impact of risky behaviour on social ,emotional,spiritual and physical
0 answers
542 views
what is the state of domestic tourism when rand is strong
1 answer
406 views
I'm not so sure if I should be changing Life Sciences to Consumer Studies OR business to Consumer Studies.. I don't know what I
2 answers
1,264 views
African slaughter rituals should be allowed in the suburbs
1 answer
675 views
A cylinder has a volume of 42cm2 and a height of 5cm.Calculate the radius of this cylinder
2 answers
731 views
The mass of a truck is 5000kg and it is stationary on an incline plane making an angle of 16 with the horizontal. The
2 answers
514 views
What effect do drugs, bullying and dangerous weapons have on schooling and education?
1 answer
345 views
Answers (23)
When a 7.50 g sample of solid NaOH dissolves in 100.00 g of water in a coffee cup calorimeter, the temperature rises from 21.6 to 37.8. Calculate the change in H for solution
When 15.0 g of sodium nitrate (NaNO3) was dissolved in water in a bomb calorimeter, the temperature reduced from 25.00 to 21.56. If the heat capacity of the solution and the calorimeter is 1071kj/°C. What is the enthalpy change for the process per mol of
What happens to the volume of a fixed amount of gas if the pressure is divided by a factor of 3 at constant temperature
Use -394, -286, -890 to calculate the standard enthalpy change of the reaction C(s) +2H2(g) = CH4(g)
An unknown compound has percent composition of 79.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye. (Atomic mass of C-12.011 g/mol; N=14.007g/mol; H-1.008g/mol).
The internal energy delta E of a system is -230 kj. If the system released 300 kj, how much work was done in the system?
The temperature of a chemistry laboratory during summer was recorded to be 29.32. A student used a thermometer to measure the temperature four times and recorded the temperatures shown: 28.62, 27.09, 29.01, 29.00, calculate the percentage error
How much of heat is needed to warm 500 g of water from 25 degrees Celsius near to it's boiling point of 99 degrees Celsius? The specific heat of capacity is 4.18j/g-k.
Calculate the root mean square velocity of the oxygen gas (O2) molecules at 77 degrees Celsius. (R = 8.314 Kg.m²/S².mol.K).
The pressure of a sample of an inert gas reduced significantly from 1000 kPa to 30kPa. The temperature increases from 27 degrees Celsius to 93 degrees Celsius. If the initial volume is 20 L, what is the final volume?
An unknown compound contains 13.04% of hydrogen, 34,78% of oxygen, and 52.17% of carbon by mass. Determine the empirical formula of the unknown compound
A metal carbonate, XCO3 of mass 2.012g was heated resulting in formation of XO, a metal oxide and carbon dioxide with a mass of 0.855g according to the reaction shown : 1.XCO3(s) = XO (s) + CO2 (g) Atomic mass of O-15.999g/mol; H-1.008g/mol;C-12.011g/mol).
James mistakenly mixed hexane with dichloromethane and water. If the density of hexane is 661 kg/m³, the density of dichloromethane is 1322 kg/m³, and the density of water is 1000 kg/m³, what is the best technique for separating the mixtures
A student performed an analysis of a sample for its calcium content and got the following results: 14.91% 14.89%, 14.88%, and 14.90%. The actual amount of calcium in the sample is 14.90%. Calculate the percentage error and precision. Comment on the
Give the answer to the correct significant digit 0.+71+96.6+2.003 + 0.0054 + 2.1 =
23,780 g of acetaldehyde (CH3CHO) reacts completely with oxygen to produce acetic acid (HC2H3O2) using manganese (II) acaetae catalyst according to the equation shown : 2CH3CHO + O2 = 2HC2H3O2 What mass of oxygen reacted with acetaldehyde?
If the theoretical yield of PbCl2 is 16.547g from the reaction of 7.000g of NaCl with 50.400g of Pb(NO3)2. Calculate the % yield of PbCl2 if 12.788g of PbCl2 was actually obtained? (Atomic mass: Na-22.990 g/mol; Cl-35.453g/mol; 0-15.999g/mol; Pb-207.200
I don't know
Risky behaviour amongst today's youth
a + 4d=23 a + 11d=37 a + 7d=14 a +7d÷7 =14÷7 1a + d =2
x=5
What is the answer
life Science
