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What two number have a sum of 645 and a difference of 151 the larger number is somewhere between the range of 392 to 402?
Let the two numbers be represented by 'a' and 'b'. Then, a + b = 645 And a - b = 151............adding these two eqations together gives :- 2a = 796 : a = 398..........and b = 645 - 398 = 247 (or b = 398 - 151 = 247).
Balanced chemical equations imply what a. Numbers of molecules are conserved b. Numbers of atoms are conserved c. Volume is conserved d. a and b or e. b and c?
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How many rectangles have the perimeter of 24cm?
Infinitely many. Let B be any number less than 6 cm, and let L = 12-B cm. Then the perimeter of the rectangle, with length L and breadth B, is 2*[L+B] = 2*[(12-B)+B] = 2*12 = 24 cm. There are infinitely many possible values for B, between 0 and 6 and so there are infinitely many possible rectangles.
How many different rectangles have a perimeter of 24 gronks?
There are infinitely many such rectangles.Consider any positive number, B which is less than 6 gronks. Let L be 12-B gronnks. Then L > 6 and so no ordered pairs (L, B) will be equal to a (B, L).Any rectangle with length L gronks and breadth B gronks will have a perimeter of 2*(L+B) = 2*12 = 24 gronks.Since the choice of B was arbitrary there are infinitely many choices for B and since each value of B gives a unique rectangle, there are infinitely many rectangles.As many as you want.
How many lines of symmetry does the letter B have?
The letter B has one set of line symmetry.The top of the B and the bottum.
How many atoms are in 15.8 moles of boron?
To calculate the number of atoms in 15.8 moles of boron, you can use Avogadro's number, which is 6.022 x 10^23 atoms/mole. Multiply 15.8 moles by Avogadro's number to get approximately 9.5 x 10^24 atoms of boron.
Calculate the number of moles in 5.34 10 21 atoms of boron?
To calculate the number of moles, first calculate the molar mass of boron (B), which is approximately 10.81 g/mol. Then use the Avogadro's number (6.022 x 10^23) to convert the number of atoms to moles. So, moles = number of atoms / Avogadro's number = 5.34 x 10^21 / 6.022 x 10^23 ≈ 0.089 moles of boron.
What is the mole ratio that can convert from moles of a to moles of b?
The mole ratio to convert from moles of a to moles of b is determined by the coefficients of a and b in the balanced chemical equation. For example, if the balanced equation is 2A + 3B -> 4C, the mole ratio would be 3 moles of B for every 2 moles of A.
How many moles of B in 20g of borax?
To calculate the number of moles in 20g of borax (Na2B4O7), we first need to find the molar mass of borax. By adding the atomic masses of all the elements in borax, we get a molar mass of approximately 201.22 g/mol. Then, we use the formula: moles = mass / molar mass. Substituting in the values, we find that there are approximately 0.10 moles of borax in 20g. Since there are four boron atoms in one molecule of borax, the number of moles of B (boron) would be 0.10 moles * 4 = 0.40 moles.
How many moles are in CF2Cl2?
To find the number of moles in CF2Cl2, you would need to know the mass of the sample. Once you have the mass, you can use the formula Moles = Mass / Molar Mass to calculate the number of moles. The molar mass of CF2Cl2 is 120.91 g/mol.
How many atoms of oxygen are contained in each what How many oxygen atoms in 21 g of O2 How many oxygen atoms in 0.812 moles MgO How many oxygen atoms in 3.2 x 1022 molecules of C6H12O6?
Each molecule of O2 contains 2 atoms of oxygen. In 21 g of O2, there are 6.02 x 10^23 molecules, equivalent to 1.204 x 10^24 oxygen atoms. In 0.812 moles of MgO, there are 0.812 x 6.022 x 10^23 oxygen atoms. In 3.2 x 10^22 molecules of C6H12O6, there are 6 x 10^22 oxygen atoms.
Consider the hypothetical reaction 3A2 2B-----C 2D How many moles of D can be formed from 5.00 moles of A2 and excess B?
From the balanced reaction, 3 moles of A2 produce 2 moles of D. Therefore, 5 moles of A2 will produce (5/3) x 2 moles of D, which is approximately 3.33 moles of D. Excess B indicates that there is more than enough B to completely react with the 5.00 moles of A2.
What is the mass of a boron sample which contains 585 moles of b atoms?
Each mole of boron atoms has a mass of 10.811 grams, as indicated by the gram atomic mass or weight of boron. Therefore, 585 moles has a mass of about 6.32 X 103 grams, to the same number of significant digits as 585.
How many moles of fluorine in 3 moles of borontrifluoride?
Boron trifluoride is BF3. So each mole of BF3 contains 1 moles of boron (B) and 3 moles of fluorine (F). Thus, 3 moles of BF3 contains NINE moles of fluorine.
Calculate the number of atoms in 13.2 mol copper.?
b. 7.95 ´ 1024 atoms
How many moles of tungsten atoms are in 4.8x10 25 atoms of tungsten?
To find the number of moles, divide the number of tungsten atoms by Avogadro's number (6.022 x 10^23 atoms/mol). Therefore, for 4.8x10^25 atoms of tungsten, you would have approximately 80 moles of tungsten atoms.
What would you multiply atoms of boron by to get the units grams of boron?
To convert atoms of boron to grams of boron, you would multiply by the molar mass of boron, which is approximately 10.81 grams per mole. This conversion allows you to relate the number of atoms to the mass in grams.
