Answer:
= 20.82 g of BaCl2
Explanation:
Given,
Volume = 200 mL
Molarity = 0.500 M
Therefore;
Moles = molarity × volume
= 0.2 L × 0.5 M
= 0.1 mole
But; molar mass of BaCl2 is 208.236 g/mole
Therefore; 0.1 mole of BaCl2 will be equivalent to;
= 208.236 g/mol x 0.1 mol
= 20.82 g
Therefore, the mass of BaCl2 in grams required is 20.82 g
The density of water is 1.0 grams per milliliter then it will be sink in water
Density is a word we use to describe how much space an object or substance takes up in the volume and in relation to the amount of matter in that object or substance its mass) and another way to put it is that density is the amount of mass per unit of volume
Here given density is 1.0 grams per milliliter and it will be sink in water because the density of water in 1.0 g/ml and this object is more dense than water and the density of an object determines whether it will float or sink in another substance and an object will float if it is less dense than the liquid it is placed in and an object will sink if it is more dense than the liquid it is placed
Know more about density
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Answer:
35.9%
Explanation:
The percent volume of the coffee solution can be calculated as follows:
% volume of coffee solution = volume of coffee/total volume of coffee solution × 100
According to this question, a cup of coffee has 71 mL of coffee and 127 mL of water. This means that, the total volume of coffee solution is;
71mL + 127mL = 198mL
% volume = 71/198 × 100
= 0.359 × 100
Percent volume of coffee solution = 35.9%
Answer:
Below
Explanation:
2) there are 28 protons in this isotope
The number that is on the bottom of the "stacked pair" tells you how many protons are in this isotope. It is often represented by the variable Z.
3) there are 35 neutrons in this isotope
Subtract the number of protons (28) from the top number
4) there are 28 electrons in the neutral element of Nickel
If you were to look at the period table and find Ni, you would see that its atomic number is 28. This number tells us the amount of protons and electrons there are in that element.
5) 62.9296694 atomic mass units
Just search it up (unless your teacher wants you to calculate it)
6) there are 92 protons in this isotope
Again just look at the Z value to find the proton count
7) there are 146 neutrons in this isotope
Subtract 238 - 92 = 146
8) there are 92 electrons in the neutral element of uranium
Again just look at the periodic table and find U
9) 238.0507882 atomic mass units
10) 12C or carbon 12 is more likely to bond with oxygen that 14c carbon 14
This is because 12C is more abundant at 98.93% than 14C
Hope this helps! Best of luck <3
Answer:
The specific heat of aluminium is 0.906 J/g°C
Explanation:
Step 1: data given
Mass of aluminium = 20.0 grams
Temperature = 5.00 °C
Mass of water = 20.2 grams
Temperature of water = 90.00 °C
The final temperature = 75.00 °C
Specific heat of water = 4.184 J/g°C
Step 2: calculate the specific heat of aluminium
heat won = heat lost
Qaluminium = -Qwater
Q = m*c* ΔT
m(aluminium * c(aluminium) *ΔT(aluminium = -m(water) * c(water) *ΔT(water)
⇒with m(aluminium) = mass of aluminium = 20.0 grams
⇒with c(aluminium) = the specific heat of aluminium = TO BE DETERMINED
⇒with ΔT(aluminium) = the change of temperature = T2 - T1 = 75.00 °C - 5.00 °C = 70.00 °C
⇒with m(water) = the mass of water = 20.2 grams
⇒with c(water) = the specific heat of water = 4.184 J/g°C
⇒with ΔT(water) = T2 - T1 = 75.00°C - 90.00 °C = -15.00 °C
20.0 * c(aluminium) * 70.00 = -20.2 * 4.184 * -15.00
c(aluminium) = 0.906 J/g°C
The specific heat of aluminium is 0.906 J/g°C
