Answer:
70.1 mL
Explanation:
First let's look at the formula for magnesium nitrate, and get the molar mass, we should end up with Mg(NO3)2 for the formula and this should have a molar mass of 148.3 g/mol.
Lets get the number of moles of the magnesium by taking the number of grams over the molar mass, (21.94 g)/(148.3 g/mol). grams cancel and we're left with approximately 0.148 moles.
Now let's plug our numbers into the molarity formula, M = n/L, this should give us 2.11 mol/L = (0.148 mol)/L, now let's solve for L, divide both sides by 0.148 which will give us 14.26 L^-1 = 1/L now we take the inverse of both sides to get 0.07012 L = L.
Now we have the liters, but the question askes for milliliters, so let's multiply by 1000, and then after rounding to sig figs we will get 70.1 mL as our answer. (Note: I used the exact values instead of the approximations throughout this explanation, so if you calculate the answer by plugging in these values, it might be slightly off.)
Answer: You can increase the weight, then test the speed, and make the weight normal and test the speed, and mark which one travels faster.
Explanation: This would test your hypothesis by comparing the speeds of the cars when more mass is added. Calculating the difference of the speed with more mass, and the speed with normal mass would give you your answer. A positive number would prove your hypothesis and a negative number would disprove it.
There are eight protons in an Oxygen's nucleus.
<h3>
Answer:</h3>
The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
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Explanation:</h3>
<u>We are given;</u>
C₂H₄ + 3O₂ → 2H₂O + 2CO₂
We need to ask ourselves the following questions;
Is the equation balanced?
- Yes, the equation because the number of atoms of each element is equal on both sides of the equation.
- That is; Reactants: 2 carbon atoms, 4 hydrogen atoms and 6 oxygen atoms.
- Products: 2 carbon atoms, 4 hydrogen atoms and 6 oxygen
What is the law of conservation of mass?
- According to the law of conservation of mass, the mass of reactants should always be equal to the mass of the products in chemical reactions.
What makes the equation obey the law of conservation of mass?
- For an equation to obey the law of conservation of mass, it must be balanced.
- In this case, <u>the equation given is already balanced and therefore obeys the law of conservation of mass</u>.
A 0.50-quart jar contains 2.0 pounds of honey. 1.9 g/ml is the density of the honey.
Density is a measure of how much "stuff" is in a given space. For example, a block of the heavy element lead (Pb) is denser than the softer, lighter element gold (Au). Styrofoam blocks are less dense than bricks. Defined as mass per unit volume.
The density of an object is one of the most important and easiest physical properties to measure. Density is commonly used to identify pure substances and to characterize and estimate the composition of various types of mixtures. Density is an important concept because it can determine which substances float and which sink when placed in a liquid. In general, matter floats as long as its density is less than that of the liquid.
Learn more about density here
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