All categories

2 years ago

How might you measure the amount of energy in the world's largest rice cake?

Chemistry

1 answer:

enot [183]2 years ago

7 0

Answer:

kindly check the explanation section.

Explanation:

The largest rice cake in the world was discovered in the year 2007 in South Korea with a weight of 8,113 lb. The amount of energy in the World's largest rice cake can be determined by using the formula below:

The energy in kJ =[ mass of water] x [specific heat capacity of water] x [change in temperature].

In order to determine experimentally in the laboratory and make use of the formula above. The first thing[STEP ONE] to do is to measure the mass of the rice cake and record it.

STEP TWO: measure a known amount of water in a boiling tube.

STEP THREE: Heat the rice cake until it catches fire with a Bunsen flame.

STEP FOUR: Use the rice cake that has already caught fire in step three above and use it to heat the water in step two until the fire burns out.

Repeat the process for three to four times and record your observations under the following headings;

[1]. Mass of cake, [2]. Temperature of water before burning, [3]. Temperature of water after burning and Temperature increase per gram of the rice cake.

You might be interested in

How many milligrams of sodium sulfide are needed to completely react with 25.00 ml of a 0.0100 m aqueous solution of cadmium nit

NARA [144]

Na₂S(aq) + Cd(NO₃)₂(aq) = CdS(s) + 2NaNO₃(aq)

v=25.00 mL
c=0.0100 mmol/mL
M(Na₂S)=78.046 mg/mmol

n(Na₂S)=n{Cd(NO₃)₂}=cv

m(Na₂S)=M(Na₂S)n(Na₂S)=M(Na₂S)cv

m(Na₂S)=78.046*0.0100*25.00≈19.5 mg

5 0

2 years ago

Read 2 more answers

At which of the following temperatures is the average kinetic energy of the molecules of a substance the least? 23.2 °C 35.2 °C

svp [43]

At 15.2°C. Kinetic energy of molecules highly depends on the temperature — the warmer it is, the faster the molecules will move, especially in fluids (gases and liquids). If we consider that the formula for average kinetic energy of molecules is:

Ek = 3/2*k*T where k is Boltzmanns constant and 3/2 is, well, 3/2, kinetic energy of molecules really only depends on the temperature.

7 0

2 years ago

What is the mass of solute in 200.0 L of a 1.556-M solution of KBr

sergejj [24]

The molarity of KBr solution is 1.556 M
molarity is defined as the number of moles of solute in volume of 1 L solution.
the number of KBr moles in 1 L - 1.556 mol
Therefore in 200.0 L - 1.556 mol/L x 200.0 L = 311.2 mol
Molar mass of KBr - 119 g/mol
mass of Kbr - 311.2 mol x 119 g/mol = 37 033 g
mass of solute therefore is 37.033 kg

4 0

2 years ago

II. Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 3.86 g of magnesium ribbo

Leto [7]

Answer:

$Excess=3.53g$

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

$2Mg(s)+O_2(g) \rightarrow 2MgO(s)$

Next, we identify the limiting reactant by computing the moles of magnesium oxide yielded by 3.86 g of magnesium and 155 mL of oxygen at the given conditions via their 2:1:2 mole ratios and the ideal gas equation:

$n_{MnO}^{by \ Mg}=3.86gMg*\frac{1molMg}{24.3gMg}*\frac{2molMgO}{2molMg} =0.159molMgO\\\\n_{MnO}^{by \ O_2}=\frac{1atm*0.155L}{0.082\frac{atm*L}{molO_2*K}*275K} *\frac{2mol MgO}{1molO_2} =0.0137molMgO$

It means that the limiting reactant is the oxygen as it yields the smallest amount of magnesium oxide. Next, we compute the mass of magnesium consumed the oxygen only:

$m_{Mg}^{consumed}=0.0137molMgO*\frac{2molMg}{2molMgO} *\frac{24.3gMg}{1molMg} =0.334gMg$

Thus, the mass in excess is:

$Excess=3.86g-0.334g\\\\Excess=3.53g$

Regards!

5 0

2 years ago

What is the density of 96 ml of a liquid that has a mass of 90.5 g?

Otrada [13]

Answer:

Density = Mass / Volume. so, x = 90.5 g / 96 mL ... The Density would be 0.942 g/mL

8 0

2 years ago